Expansion help

I'm on level 159 and have 40 million dollars. I only have 63 expansion cards and need 75 to get to go up to 22x22 expansionexpansion. I am finding it impossible to get the cards so that i can move up in the game. It is starting to not be fun anymore not to be able to move up. I'm getting bored. Any cheats or help how to earn the expansion cards?? Thanks