Coins and Coin modifiers can be purchased in the in-app store for the following prices.

5,000 Coin Pack:
Purchase for $0.99.

50,000 Coin Pack:
Purchase for $4.99.

150,000 Coin Pack:
Purchase for $9.99.

400,000 Coin Pack:
Purchase for $19.99.

Coin Doubler:
Purchase for $4.99.