My mom used to save gift cards and use them for "special things", to get something she really wanted but was a splurge for her. When she died, she had probably like $800-900 in gift cards waiting to be spent, and they'd lost like a third of their value. They were part of my mom's estate, so they went to my sister (the executrix). When my sister died, I found those exact same gift cards, still unspent, only this time they'd lost all their value. Plus she has a bunch of gift cards of her own that she'd been saving that had lost a bunch of value as well.

I know I'm fortunate that I don't need to scrape money, and that not everyone can afford to do this. But after losing out on a bunch of money, this is what I do: when someone gives me a gift card, I spend it immediately and enthusiastically tell the giver what I got - or, in some cases, supposedly got: occasionally I'll use the card to buy a gift for someone else, or I'll just buy gas or groceries. But I use it on something I want or need, even if it's just in the vaguest way. That avoids losing the value of the money, which I absolutely hate.

But I take the birthday or holiday or thank-you or thinking-of-you card that the gift card came in, and I'll tuck in the same amount of cash as was on the gift card. I have a little stash of cards in my desk (and my heir knows to check those cards), all with some amount of money in them. And when I'm feeling down, or really need a treat, or just need to remember that I'm loved, I go pull out the cards and read through some of them. And if I'm still feeling bad, I may pull out some money from the card and go buy myself something - an ice cream or a nice dinner or a pair of socks - it doesn't matter. To me, it's that person giving me a giant hug on a day that I really need it, whether that person is even still around - to me, that's an immensely valuable gift, and something that I always treasure.

Also, to keep each gift giving, I usually sneak back a couple weeks later and put the same amount of money back into the envelope: just because I spent that specific money doesn't mean my mom or grandma loved me any less, and sometimes I need to be reminded of that.