Just noticed this, not sure when they all went on sale or for how long, but the following titles are 75% off:
Race 07 - $4.99
Race On Expansion - $6.24
GTR Evolution Expansion - $4.99
http://store.steampowered.com/search/?term=simbin
Race 07 - $4.99
Race On Expansion - $6.24
GTR Evolution Expansion - $4.99
http://store.steampowered.com/search/?term=simbin