I purchased this hack from www.highwaystech.com, and it worked great!

Just follow the instructions that are included with the download, and you're all set.

FYI: Use at your own risk, I do NOT take any responsibility for this hack!

You may completely lose all the progress you have already made, but here's what you'll gain:

Unlimited Coins
Unlimited Shop
Buy unlimited
Unlimited Fun

That being said, ENJOY!