Using a Prepaid Debit or Credit Card

Set up a pay pal account and put the remaining money on the paypal account. this way you can save it and use it for itmes like on ebay and other sites that accept payment through pay pal.

how about buying a small candy bar or pack of gum and paying any difference from what is on the card and the purchase

What about combining them on a small purchase through something like eBay's MissionFish?

Otherwise, I know Change Round Up

https://www.cha  com/default.aspx

offers the ability to do small change donations at certain websites.

You can always finish out the balance with paying it on a purchase. Then pay the remainder with either a credit card, debit card, or cash - or even all three!

Join PayPal. Then use it as your first payer with anything else as the second payer.

One important thing is to know exactly how much is remaining on the card. If there is 25 cents, then use the card the same as you'd use a quarter. Knowing the remaining balance will help the cashier zero-out your card. The second thing is to buy prepaid cards that don't expire and don't charge fees. These do exist, but are hard to find. The PayPal suggestions already given are good, too.

I'd buy postage stamps, or use when mailing a package or oversized envelope.

If you save up a few cards, you can use them at the register for a purchase. Use as many cards as you want to pay for the purchase. The trick to using them is to know the EXACT amount that is left on the card.