The latest of my random bs lists, made this as I went along the mercato:
Premier League
Liga BBVA
Serie A
Ligue 1
Bundesliga
Liga NOS
Russian Premier League
Süper Lig
Football League Championship
Most expensive transfers
Neymar - Barcelona > PSG €222m
Ousmane Dembélé - Dortmund > Barcelona €105m
Romelu Lukaku - Everton > Man Utd €84.7m
Álvaro Morata - Real Madrid > Chelsea €65.5m
Benjamin Mendy - Monaco > Man City €55m
Alexandre Lacazette - Lyon > Arsenal €53m
Kyle Walker - Tottenham Hotspur > Man City €51m
Bernardo Silva - Monaco > Man City €50m
Gylfi Sigurdsson - Swansea City > Everton €49.4m
Nemanja Matic - Chelsea > Man Utd €44.7m
Mohamed Salah - Roma > Liverpool €42m
Leonardo Bonucci - Juventus > Milan €42m
Corentin Tolisso - Lyon > Bayern Munich €41.5m
Ederson - Benfica > Man City €40m
Tiemoué Bakayoko - Monaco > Chelsea €40m
Federico Bernardeschi - Fiorentina > Juventus €40m
Paulinho - GZ Evergrande > Barcelona €40m
Davinson Sánchez - Ajax > Tottenham Hotspur €40m
André Silva - Porto > Milan €38m
Alex Oxlade-Chamberlain - Arsenal > Liverpool €38m
Danny Drinkwater - Leicester City > Chelsea €38m
Vitolo - Sevilla > Atlético Madrid €36m
Victor Lindelöf - Benfica > Man Utd €35m
Antonio Rüdiger - Roma > Chelsea €35m
Nélson Semedo - Benfica > Barcelona €35m
Theo Hernández - Atlético Madrid > Real Madrid €30m
Danilo - Real Madrid > Man City €30m
Keita Baldé - Lazio > Monaco €30m
Jordan Pickford - Sunderland > Everton €28.5m
Michael Keane - Burnley > Everton €28.5m
Mahmadou Sakho - Liverpool > Crystal Palace €28.2m
Franck Kessié - Atalanta > Milan €8m loan + €20m obligation
Davide Zappacosta - Torino > Chelsea €28m
Marko Arnautovic - Stoke City > West Ham Utd €27.9m
Kelechi Iheanacho - Man City > Leicester City €27.7m
Davy Klaasen - Ajax > Everton €27m
Youri Tielemans - Anderlecht > Monaco €25m
Andrea Conti - Atalanta > Milan €25m
Andrey Yarmolenko - Dinamo Kiev > Dortmund €25m
Serge Aurier - PSG > Tottenham Hotspur €25m
Leandro Paredes - Roma > Zenit St. Petersburg €23m
Mathias Vecino - Fiorentina > Internazionale €24m
Milan Skriniar - Sampdoria > Internazionale €23m
Nathan Aké - Chelsea > Bournemouth €22.7m
Marko Arnautovic - Stoke City > West Ham Utd €22.3m
Hakan Calhanoglu - Bayer Leverkusen > Milan €22m
Panagiotis Retsos - Olimpiacos > Bayer Leverkusen €22m
Kingsley Coman - Juventus > Bayern Munich €21m
Andre Gray - Burnley > Watford €20.4m
Juan Cuadrado - Chelsea > Juventus €20m
Nikola Maksimovic - Torino > Napoli €20m
Óliver Torres - Atlético Madrid > Porto €20m
Harry Maguire - Hull City > Leicester City €20m
Niklas Süle - Hoffenheim > Bayern Munich €20m
Maximilian Phillip - Freiburg > Dortmund €20m
Luis Muriel - Sampdoria > Sevilla €20m
Dalbert - Nice > Internazionale €20m
Blaise Matuidi - PSG > Juventus €20m
Kevin Kampl - Bayer Leverkusen > RB Leipzig €20m
Kevin Wimmer - Tottenham Hotspur > Stoke City €19.4m
Nabil Bentaleb - Spurs > Schalke €19m
Mateo Musacchio - Villarreal > Milan €18m
Ricardo Rodríguez - Wolfsburg > Milan €18m
Chicharito - Bayer Leverkusen > West Ham Utd €17.8m
Medhi Benatia - Bayern Munich > Juventus €17m
John Anthony Brooks - Hertha BSC > Wolfsburg €17m
Jhon Córdoba - Mainz > FC Köln €17m
Mattias Ginter - Dortmund > Borussia MG €17m
Rúben Neves - Porto > Wolverhampton Wanderers €17m
Dani Ceballos - Real Betis > Real Madrid €17m
Lucas Biglia - Lazio > Milan €17m
Ismaila Sarr - FC Metz > Rennes €17m
Mario Lemina - Juventus > Southampton €17m
Chris Wood - Leeds Utd > Burnley €16.4m
Wesley Hoedt - Lazio > Southampton €16.4m
Sam Clucas - Hull City > Swansea City €16.3m
Simone Zaza - Juventus > Valencia €16m
Yuri Berchiche - Real Sociedad > PSG €16m
Britt Assombalonga - Nottingham Forest > Middlesbrough €15.9m
Oliver Burke - RB Leipzig > West Brom €15.2m
Gianluca Caprari - Inter > Sampdoria €15m
Vicente Iborra - Sevilla > Leicester City €15m
Terence Kongolo - Feyenoord > Monaco €15m
Sebastián Driussi - River Plate > Zenit St. Petersburg €15m
Ignacio Camacho - Málaga CF > Wolfsburg €15m
Sven Bender - Dortmund > Leverkusen €15m
Giovanni Simeone - Genoa > Fiorentina €15m
José Izquierdo - Club Brugge > Brighton €15m
Rúben Semedo - Sporting CP > Villarreal €14m
Enes Ünal - Man City > Villarreal €14m
Rick Karsdorp - Feyenoord > Roma €14m
Thiago Maia - Santos > Lille €14m
Jay Rodríguez - Southampton > WBA €13.7m
Marten De Roon - Middlesbrough > Atalanta €13.5m
Cengiz Ünder - Basaksehir > Roma €13.4m
Marco Rog - Dinamo Zagreb > Napoli €13m
Steve Mounié - Montpellier > Huddersfield €13m
Jean-Kévin Augustin - PSG > RB Leipzig €13m
Davy Pröpper - PSV > Brighton €13m
Emre Mor - Dortmund > Celta Vigo €13m
Fernando Llorente - Swansea City > Tottenham Hotspur €13m
Wilfried Bony - Man City > Swansea City €13m
Yevhen Konoplyanka - Sevilla > Schalke €12.5m
Bruma - Galatasaray > RB Leipzig €12.5m
Bruno Peres - Torino > Roma €12.5m
Roque Mesa - Las Palmas > Swansea City €12.5m
Richarlison - Fluminese > Watford €12.4m
Wojciech Szczesny - Arsenal > Juventus €12.2m
Ömer Toprak - Leverkusen > Dortmund €12m
Mahmoud Dahoud - Borussia MG > Dortmund €12m
Denis Zakaria - BSC Young Boys > Borussia MG €12m
Gerard Deulofeu - Everton > Barcelona €12m
Mattia De Sciglio - Milan > Juventus €12m
Pablo Fornals - Málaga > Villarreal €12m
Pedro Rocha - Grêmio > Spartak Moscow €12m
Asmir Begovic - Chelsea > Bournemouth €11.5m
Jacob Murphy - Norwich City > Newcastle Utd €11.3m
Florian Thauvin - Newcastle Utd > Marseille €11m
Adnan Januzaj - Man United > Real Sociedad €11m
Stevan Jovetic - Internazionale > Monaco €11m
Nikola Vlašić - Hajduk Split > Everton €10.8m
Rodrigo Bentancur - Boca > Juventus €10.5m
Serge Gnabry - Werder Bremen > Bayern Munich €10m
Nicolas Pepe - Angers > Lille €10m
Nany Landry Dimata - Oostende > Wolfsburg €10m
Bertrand Traoré - Chelsea > Lyon €10m
Lorenzo Pellegrini - Sassuolo > Roma €10m
Luis Gustavo - Wolfsburg > Marseille €10m
Florian Lejeune - Eibar > Newcastle Utd €10m
Adam Ounas - Bordeaux > Napoli €10m
Loïs Diony - Dijon > Saint-Étienne €10m
Adama Diakhaby - Rennes > Monaco €10m
Alain Saint-Maximin - Monaco > Nice €10m
Pape Cheikh - Celta Vigo > Lyon €10m
Roberto Inglese - Chievo > Napoli €10m
Notable loans
Kylian Mbappé - Monaco > PSG (1 year + "binding" €180m option)
James Rodríguez - Real Madrid > Bayern Munich €10m (2 years)
Douglas Costa - Bayern Munich > Juventus €6m (1 year)
Patrik Schick - Sampdoria > Roma €5m (1 year)
Grégoire Defrel - Sassuolo > Roma €5m (1 year)
Mário Rui - Roma > Napoli €3.75m (1 year)
Benedikt Höwedes - Schalke > Juventus €3.5m (1 year)
Duvan Zapata - Napoli > Sampdoria €3m (1 year)
I'll update it with spending and net spending per league when I can be bothered.