In my searches I came across this and bookmarked them
http://www.cyclingteam.org/
And this
http://www.localbiketrader.com/
Another thing to look at
http://www.bikesonline.com/products/...1-Black-M.html I have a Specalized bike called a Globe in an extra large. For this one you would definitely want stronger wheels. As I at 280 lbs., when i started, destroyed them on smooth concrete. I found a tandum set to use