Where can you buy a prepaid phone card for a great price? The good news for you is that there are many places that sell prepaid phone cards, so you can definitely do some price comparison shopping. In general, you will find that a large department store or grocery store will usually have a better price on phone cards than a small convenience store. In addition, you can buy prepaid phone cards online for very attractive prices. Make sure you are getting the best deal, because the options are numerous and the deals are definitely out there if you will just take the time to find them!