For a fit (if you dont want to go to a shop)
http://www.competitivecyclist.com/za...LCULATOR_INTRO
cheap bikes (i dont know anything about these bikes but plenty of people around here order modobecanes from these guys):
http://www.bikesdirect.com/products/...iragesport.htm
http://www.bikesdirect.com/products/...ane/mirage.htm