Found some codes, all should be valid, but they are old, so who knows. Enjoy.
Star Wars: Rebellion PEYPG-F9FPX-QJZ3L
Edge of Space 2PHEI-BTZZF-IXBBC
16-Bit Trader E84LP-ETT04-50WWP
Septerra Core 7ZT5K-6RV66-ME834
Septerra Core DL33N-78IVQ-A77CB
Warmachine Tactics YIIWR-QHCQL-N3PXQ
WARMACHINE...