I haven’t purchased a gift card in a while. When I tried today, I noticed that, despite being able to manually input a gift card value on many cards (instead of a preset amount), there is apparently a minimum that will process. For example, as in Mr V’s case above, a $15 Walmart card works. But when I tried to get a $15 ebay card, the screen would just refresh on the page. It wouldn’t move on to the billing info screen until I input a high enough value, in this case, $25. If you want a particular card and you are going to fully use it up quickly to not have much money tied up, you’re still getting your $2.50 discount anyway, but something to keep in mind.