Your better off going to garage sales/flea markets for used bikes, as people usually want to get rid of them ASAP for pretty cheap. All the bikes I've used i bought for less than 20$ (most were free)
Really any bike is a good starting one, its the maintenance that's the most important part IMHO, as the main reason the cheaper kits get bad reviews is that people never tighten up loose nuts/bolts and then things vibrate more and break, rinse and repeat. Yes there cheap, but you can improve upon them for very little $ invested (quality bolts are like 15$ For everything)
Really any bike is a good starting one, its the maintenance that's the most important part IMHO, as the main reason the cheaper kits get bad reviews is that people never tighten up loose nuts/bolts and then things vibrate more and break, rinse and repeat. Yes there cheap, but you can improve upon them for very little $ invested (quality bolts are like 15$ For everything)