Just an FYI that it's Steam's annual summer sale (they also do a winter one usually) with different deals every day. There's also the "get achievements for redeemables and raffle entries" thing this time around. The daily deals reset at 1pm server time, and there are others that are good through the 10th.
http://store.steampowered.com/
You can typically find some great deals... I've already picked up a bunch today, including Heroes of Might and Magic 5 + DLCs for $5, Shatter for $2.50 and great old school RPGs Eschalon 1 and 2 for under $5 each. I already had SpaceChem but you may want to check that out at $5 too, try the demo first, it's a pretty cool game if it's up your alley.