I'm using Cascade Fixation, but I'm NOT in love with this yarn.

Do you have a favorite cotton yarn for knitting socks/footie socks? And where do you buy it?

I'm not particularly found of cotton sock yarns. I would say that Sockotta is fave of those that I've tried ;)

I tried Sockotta, but I found that cotton sock yarn just doesn't have the elasticity of wool blend yarns. I now just use wool blends and save the cotton for other things.