http://www.discovercard.com/customer-service/account/cash-over.html How do I get cash over? Easy. Just use your Discover Card at checkout and choose how much cash you'd like. Will I be charged a transaction fee for using cash over? No! There is no fee for the transaction. Is there a special interest rate applied? Not at all- the same purchase APR apply, just like your other Discover Card purchases. Is there a limit to how much cash I can get over my purchase? Cash Over transactions cannot exceed $120 daily. Most stores have a cash over limit. Check with your local store.