Adding Games

Simple post here. Looking to add games to my NFL Blitz cab. Mostly want NBA Jam, Turtles in Time, a few others.

What's the easiest/cheapest way to go about this?

I've looked into things like upgradearcade but I don't feel like it's totally necessary to get an entirely new control deck (even though a trackball would be a cool feature).

Any help pointing me in the right direction would be awesome. Thanks.