i assume you have internet access because your using it now try ebay or other online stores try your best to avoid wall-mart. I live in the UK and i know that wall-marts rubbish.
i bought the bike a while ago it was cheap. BMX. The idea was to rebuild and refurbish but i was cycling home when the chain slipped and refused to work. I think its my back sprocket instead of staying stationary in order to drive the bike forwards it spins with the chain. Help Please?