Darnit, I started amassing a collection of these HF clamps for my upcoming build... Bummer... Oh well, I'll just start spending more money on the better ones.
I've learned that HF has some great deals, but that you have to do some research before buying... Fortunately (or unfortunately depending on your view), I live very close to their main warehouse in Camarillo, CA and they even just opened a retail store close to my business in Ventura!
"Uh, why were you gone so long to the bank?"
"Ummm...long lines..."

Not sure if they still have them, but I got a blister pack of those Irwin clamps at Costco awhile back, I think it was ~$20 for six clamps, two of each size....