CS3 is $649 (extended $999) if you are buying it for the first time. Upgrades are $199 (extended $349).
I've seen CS2 for $49.99
CS DVDs are probably being used as urinal cakes nowadays, so keep an eye out at the ballpark this summer. You might get lucky.
Or just wait  six months for CS4 to be released, then buy CS3 for $50 or so.

I reckon someone that forks out $99 for Bryce could cough up $50 for CS2.

Friends don't let friends use booleans.