Those places are reasonable prices, suicide doors, enhanced concepts, and hotrides mag, that aim ebay stuff is complete CRAP. Just think about this, this is your suspension that supports your car and controls your car/truck, do you really want to be cheap about it, considering it has control of your life and anyone else that rides with you. Good quality isnt cheap, and if you buy the cheap shit, expect nothing but problems, i have to fix peoples air suspension set ups everyday because they didnt want to spend the money and do it right the 1st time.