This is a weekend deal apparently, so it probably expired sometime tomorrow.
Some recommendations:
Gothic 3 $4 http://www.gog.com/game/gothic_3
Spellforce platinum $4 http://www.gog.com/game/spellforce_platinum
Painkiller Black $4 http://www.gog.com/game/painkiller
Desperados $2.40 http://www.gog.com/game/desperados_wanted_dead_or_alive