Don't know how they're that cheap, but I'd buy them. Years ago, somebody was selling some brand new tires on eBay and they listed the price wrong and I bought them and they had to stick to the price.
They might be closing out that size too, they're a bit small for some applications. Great price though if you can use them. It happens. Holley had a few famous close-out sales with some parts only costing a buck or two, I got some really nice early style seatbelts from one of their sales and they were only like 4 bucks each. There was also someone closing out chrome plated Ford flathead headers a couple years ago and I got two sets off of Amazon for $38 a pair, one set made it onto my T roadster, they're excellent quality. I wonder if this is a similar situation. They were a slow mover and Summit isn't going to carry them anymore so they're getting dumped cheap. Would be nice to know the date codes on them but that's probably a bridge too far.
Excelsior tires for 100 bucks a piece, Coker isn't going to sell outdated tires, where else you going to buy a great looking Hot Rod tire for that kind of money? HRP
the Excelsior tires I have are rounder than the Firestones I have had and balanced out nicely with a few ounces of weight...dual plane I would drop the hammer at that price if I hadn't already earlier this year....