How do I get more checks in mafia city

[#151][#148][#149][#147] how to get more checks ?

[#144] Black market : the frequent you exchange, the better you will get [#2]

For example: 

1 wine in this new account I can only get 100 while my  elite 3 mansion = 2124 per exchange 

[#144] Do daily mission 

[#144] Go to casino

[#144] Hitman building : if you already have this building, invest in " equipment service " -> low check exchange " to lower the price.

the hitman building picture i uploaded on my wall if you wanna see [#64]