Super Monday Night Combat Steam Gift

Guess I got $100 banging around in my alts inventory.

You might get that if you find a right buyer, but then again, you can get 50$ for almost anything if you find the right buyer. :D

Subnautica used to have special offer on Humble Store where for 20$ you could get a special edition with an ability to tune your own Hull Plate however you wanted. It was a limited offer and for that reason you can find only a few offer on Steam market for special Hull Plates. They used to cost over 100$ a year back.

These kind of promotions that have either a limited amount or a date limit get up in price, like marketable Warframe and Path of Exile stuff. And stuff like gifts for SMNC, Evolve etc. games just goes down thanks to their developers who first put a price on their games, then make it free because of the low player base.

Edit: You might get about 1$ for it though, because people like me, like to collect +1 games and in free games you need to either have an old gift which adds it to library (like yours) or buy something in-game. Lowest thing in SMNC costs probably less than 1$ but not everyone knows that. ^_^