I will admit that I buy almost all my tools at Harbor Freight now(I still won't buy anything with a motor, sprays paint or has a cutting edge, though). However, for single sockets, you still can't beat Sears Craftsman. I just bought a 30mm socket for $9. Couldn't get it at any price at HF.
Judging from the look of the store I was in, I would hurry and get what I need while they're still in business.