[CC's 62]

I'm looking at replacing the ball joints on my 62. Does anyone know why CPP wants $39 a piece for uppers and lowers compared to POL wanting $177 for lowers and 68 for uppers? I don't want to spend more than I have to but I also don't want inferior parts either. Does anyone have any experience in this area? Whats your thoughts on all the different brands/companies offering replacement ball joints?