A salmagundi of games on sale at the moment:
Takedown Red Sabre $1.50 (90% off but -ive reviews) http://store.steampowered.com/app/236510/
Space trader marine $0.50 (90% off) http://store.steampowered.com/app/11240/
Disciples 2 Rise Elves $1.62 http://store.steampowered.com/app/1630/
Disciples 2 Gallean's return (75% off) $1.62 http://store.steampowered.com/app/1640/
Avadon $2.50 http://store.steampowered.com/app/112100/
DCS Flaming Cliffs 3 $30 (40% off) http://store.steampowered.com/app/249320/
DCS A10C $10 (75% off) http://store.steampowered.com/app/245810/
DCS Blackshark $10 (75% off) http://store.steampowered.com/app/240280/
Grotesque tactics 1 + 2 Bundle (75% off) http://store.steampowered.com/sub/12355/?snr=1_5_9__403
Wow. Takedown Red Sabre really didn't do too well for itself. It's barely 4 months old and selling for a dollar-fifty.
The Kickstarter campaign was hardly successful though, they only achieved half of their goal amount.
Flaming Cliffs 3 is at it's lowest price ever though and it's a good price for the amount of content you get (technically 7 planes, though the Su-33/Su-27 and MiG-29S/29A are largely interchangeable, ultra-realistic simulations for the Su-25 and A-10A with the other plane's AFM modules to be released soon.) You really do need a joystick for it though.