Spare key from Humble 2K's Game Together Bundle. I should have put the region restrictions in correctly this time but just in case, here are the restrictions copy-and-pasted:
AD AE AF AL AO AT BA BE BF BG BH BI BJ BW CD CF CG CH CI CM CS CV CY CZ DE DJ EE EG EH ER ES ET FI FR GA GB GG GH GM GN GQ GR GW HR HU IE IL IM IQ IR IS
Please only enter if you are NOT from the countries listed above. Good luck, stay safe and healthy :)