Coin Packs are in-app purchase items in Ninja Fishing. They can only be purchased if In-App Purchases are enabled in the device settings and when the player is connected to the Internet.

Here are the coin packs so far:

Coin Pack Cost
10,000 Coins $0.99 USD
100,000 Coins $1.99 USD
250,000 Coins $4.99 USD
550,000 Coins $9.99 USD
1,000,000 Coins $19.99 USD