Is it a World Class box or non World Class? If it's a rebuilt WC, that's a decent price.
Personally, I'd try to find a good used one, WC or otherwise. WC's are not that easy to come by but, I did find one here in San Diego for $150. I've put plenty of miles on it since I installed in Fall 2004.
A good boneyard here is down by Coors Amphitheatre. It's called El Pulpo - Pick Your Part. They have 1/2 price weekends fairly regularly and I've seen plenty of T5's whether in S10 or Camaro.
What's this going in anyways?
-David