UPDATE 4/28/09: It appears as though this deal is over. We will keep you updated if we see anymore “too good to pass up” sort of deals from Steam.
This weekend, Valve is offering The Orange Box in all of its award-winning, immensely entertaining glory for just $9.99. If $50 for this package was considered the Best Deal Ever, then $10 must be whatever 5 times that is. The current list price for all of these games combined, if bought individually, is $84.95. The running price for The Orange Box is $29.99. This weekend you only pay $9.99.
See for yourself in the Steam Store