You got it, taken straight from Gamestop's web page, comes this quote, from me to you.
"For a limited time all customers who pre-order Half-Life 2 Orange Box will SAVE $5 off the regular price of $59.99. This offer is valid both online and in-store and applies to pre-orders only.
So I don't know if this is old or not but this is my first time hearing about it.
This seems to apply to all versions of the game and is a mighty fine deal. I may have to go drop $5.00 for a pre order for this sweet discount.