That does seem alittle high for empty 2X12's. I paid $125 each for my Hollywoods. They're slant cabs made from 3/4 marine plywood covered with that grey carpet-like stuff (my cat loves 'em!)
They've got the standard metal grills with the 4 clamps. Kinda ugly but they sound fine with Vintage 30's and some fibreglass batting inside. They've survived 10 years of gig duty without falling apart so that's a big +.
I'd agree that sounds pretty high. What you have to figure is the cost of putting speakers in them vs the cost of buying complete cabs. That will tell you if it's a good deal or not.
Coming from a guy who just purchased a loaded 4x12 cabnet with 4 scorpions and flight caseable to boot for only 100 bucks, Id say you should look harder for a better deal.