I'll be out in June for the south maui tri and need to find a bike for my 7 year old to ride while we are in town. There are no rental shops for kids bikes that I have found due to liability. My son and I would like to use bikes for our main transportation to/from the beach. Any ideas on where to find a cheap 20" boys bike? The only thing I have come up with is Buying one from walmart then returning it or just leaving it with friends when I come home.