Just an FYI, Irwin is pulling out of Home Depot and selling at Lowes instead. I stopped in there last night to look at wood and clamps for a THT build. All the Irwin clamps are on sale except the quick grip ones. Most clamps are almost 50% off, so a good buy if you need some for your shop.
I picked up 6", 36" and 48" clamps for less than any generics would have cost at HF or the like.
Happy building...