Specifically, a samsung rewards prepaid card. Basically, I can use it to buy other gift cards or such in stores but I don't have a card number to put into a website. I suppose I could use it to buy another prepaid card but I don't know where I would go from there. Options?
I suggest you go to Localbitcoins and search for buyers near your location. Optionally, find a buyer from anywhere and buy whatever giftcard they want with your samsung rewards card. Your second option is paxful, which is very close to localbitcoins, but I'd personally pick Localbitcoins anyday. Third option, if you can buy an Amazon giftcard, I believe you can sell that to purse.io and receive bitcoins in return.