Today at Cardpool new referrals get a $5 Credit off of their first Cardpool purchase . I’ve been shopping at Cardpool for years with great success. Even better, there’s no min purchase! Best play here is to find a low value gift card and get it super-cheap. Check Target. I see bunches in there in the $10-15 range, both e-gift cards and physical.
You can also clean out your junk wallet by selling the cards you aren’t using. For selling, I prefer Cardpool as they don’t charge fees. I usually get the Amazon gift cards when I sell as you get much more bang for your old cards that way.