Buying retail steam games

[warfreak]

I wish to buy a few of valve games but I hate purchasing it online. (Actually i dont have a credit card or paypal account ) So i'm thinking of buying discs of following games:-
Half Life 2 Deathmatch
Half Life 1 Deathmatch
Counterstrike Source
Counterstrike 1.6
Left 4 Dead 2

Steam has pretty decent offers online. But since online is not an option for me, what price am I expected to pay for these games?

[bippukt]

L4D2 is a new game, so I think you will have to pay 1000 for it.

EDIT: You might get it for 700 though.

CS you should get for 500 or less (it comes in packs like CS Anthology). I don't know about the rest, but they shouldn't be more than 500. Look for packs, if possible.

Apart from L4D2, the rest you can theoretically get cheaper on Steam itself - I got HL1 complete and HL1: Source (includes the DM version) for a total of $8. But unless you are a regular on Steam's website, you will probably miss it.