Have bunch of GOG codes from Prime Gaming:
Bioshock Remastered
Tomb Raider Legend
Hive Jump 2: Survivors
Kerbal Space Program
Thronebreaker: The Witcher Tales
Lego The Hobbit
Ghost Song
The Falconeer
Moonlighter
Showgunners
9 Years of Shadows
Cursed to Golf
Hell Pie
GreedFall Gold Edition
Industria
Arcade Paradise
Spells & Secrets
En Garde!
Hard West 2
Stray Gods: The Roleplaying Musical
WANT:
Offers (Amazon, PSN credit, Xbox credit)
I'm not using GOG so I don't know how much is it worth, if it's worth something at all.