I have a never worn (tags still on it) Spyder Comp GS suit in the grey bug pattern, size XXL. Before you say "you big fatty!!!", that size will fit a male 5'11"-6'3" and 185-205 lbs. I ordered it on the large side (I'm 5'11", 180 lbs) to fit a base layer under it comfortably, since it gets pretty cold up here during the early race season. As it is, it's pretty tight even without the base layer. I'll take $175, which is cheap considering I paid $200 for it at Reliable Racing last Spring (I think the same suit is $249 now). Reliable has online fitting charts if you're not sure of your size in a particular brand- they do vary greatly.
If that isn't your size, I would check Schneider Racing USA
to see if they still have a size and/or style you'd like in stock. The extra money spent is well worth it, since I think they are waaayyy more comfortable, better made, and better looking than any of the other brands I've worn (Spyder, Beyond X, Louis G...). I got a FIS and a non-FIS (much warmer) from Franz at Schneider, and that's why I never used the Spyder suit.
Also, suits show up from time to time on eBay. The US Ski Team suits can go pretty high ($400+), but the basic suits or the less attractive ones can go for much less. Know your size in that particular brand before you bid, though.
Hope this helps.