I get mine from here: http://www.eggwhitesint.com/
I've tried ordering them from other vendors (bodybuilding.com) but it took them an extra week to get it to me.
I had been suffering some pretty severe knee pain myself once I started up on the 5x5. By squatting 3 times a week it really brought out my deficiencies in thesquat. I found that by stretching more and widening my stance I was able to make the pain go away.
Phil is one of the nicest guys you'd ever meet. He is a real class act. I've never seen him disprecptful to anyone that's approached him.... Not even the guy that asked him about his diet plan while Phil was in mid-set of deadlifts.