I have ordered and just received this squat rack from NY barbell:
It appears to be decent quality and was quite stable with 225lbs on it. The kicker is that it is extremely cheap - $129 with free shipping (I think they tacked on an $8 handling fee) - and I got it in two days. It weights about 55lbs and is reasonably easy to move.
I'm sure that Ironmind and similar products are far better, but they are also 3x the price.