The US ESPN has published an extensive report on the best deals for Barcelona since 2009 until now.
1- Suarez, in 2014 he bought him 65 million euros from Liverpool he played 263 games, he scored 187 goals.
2- Jordi Alba, in 2012 he bought 14 million euros from Valencia, playing 309 games, scoring 16 goals.
3- Stegen, in 2014 he bought him 12 million euros from Gladbach playing 209 games.
4- Neymar, from 2013 to 2017 bought him 86.2 million euros from Santos, sold him 222 games, 186 games, scored 105 goals.
5- Mascherano, from 2011 to 2018 bought it for 24 million euros from Liverpool, sold it for free to the Chinese club Hippy he played 334 games, scored 1 goal.