Party In My Dorm Tutorial: How to sell piggy banks. Go to the “Shop” at the bottom menu. Scroll down to MISC Click on the pig. It will have a pop up with the option of buying or selling. It will also tell you how many piggy banks you currently have. If you have some to sell, click on “Sell” and enter the amount. Then click on “Ok” All the cash will go into your bank. You get 7,500,000 for each bank.