Could possibly get it for free? Last sale that had games as rewards for the meta game, I got the valve complete pack
What sort of things does this entail exactly? If it involves buying and playing a lot of games over the sale period, it's probably not worth it for someone like me who has an extremely small library and relatively low sale ambitions.
Half-Life will probably be the same price as it is now during the summer sale, and you will probably also be able to pick up the Valve complete pack or something that includes Half-Life and lots of other stuff at a massive discount. You'll know for sure when the sale hits this October.
I figured it was a constant price looking at steamgamesales, but I wanted to check in the thread. I already have the Portal series and those were the other Valve titles that I was interested in.