Not exactly a "deal" per se, but the recent-ish Umihara Kawase digital releases in the US are quickly disappearing due to Agatsuma Entertainment, the company behind them, shutting down in early December.
They've already been delisted from Steam but Humble Store and Green Man Gaming still have keys for them.
HS:
Sayonara Umihara Kawase - $14.99
Umihara Kawase Trilogy - $29.99
UK Trilogy is currently out of keys but says they should be getting more, hopefully.
GMG:
Sayonara Umihara Kawase - $14.99
GMG also has a 20% voucher good till Jan. 4, NWYEAR-20PERC-WTHGMG
The Vita port of Sayonara Umihara Kawase is still up on PSN for $19.99 and includes the original UK for free. Expect it to vanish relatively soon as well, maybe as early as next week's PSN update.