We recommend this one:
But you may want just the Potatoman game, so...
(For the GAME / SOUNDTRACK bundle, scroll down further... )
If the MAC APP STORE is your thing, then:
Or buy just the game with Paypal, Amazon Payments or Google:
Yes, there's more! We also have a GAME + SOUNDTRACK package.
If you dig the Humble Store, go with this option:
And finally, if you just want the sountrack: