http://dealnews.com/Valve-PC-Game-downloads-at-Gamefly-75-off-extra-20-off-deals-from-1-/631902.html
"Gamefly cuts 75% off nine Valve game downloads for Windows. Plus, coupon code "BETATHANKS" cuts an extra 20% off. With prices starting at $1, most games are at all-time price lows. Discounted games include Portal 2, Half-Life 2, Team Fortress Classic, and more. Coupon expires November 8.A best bet is downloads of Left 4 Dead 2 for Windows (pictured) for $4.99 before the coupon above, $3.99 after. That's a buck under our mention from two weeks ago (which also included the Mac version) and the lowest price we've ever seen for this game. (It's also a current price low by $16.)"