My gf has expressed an interested in starting cycling . The biggest barrier to this is that she doesn't have a bike. So I need advice on getting a road bike that doesn't cost the earth (in case she really doesn't like it),and I could with some good advice and links to places to get one. (She's on the petite side (5'1") which cuts down the options unfortunately.) So, are there any good sites/places to get 2nd hand bikes? Or if the options are too low, does anyone have any recommendations for places to get new ones?