Update: My son and I finally got around to unfolding one of these and measuring it this evening. Looks like my initial suspicions were unfounded. The blankets I received appear to actually be the proper size for the 1 to 2 person size heatsheet. It was a bit shy of the 60 inches wide at 58 and 1/2 inches, but was a bit longer than the 96 inches at 99 and 1/2 inches. Close enough for me and a bargain at the aforementioned 3.19 per sheet with free shipping. Check them out here:

http://www.ebay.com/itm/Adventure-Medica...=item2c63797a82

No affiliations. As I said I ordered 15 of them, and was suspicious at first, and while I only measured one of the blankets I received, I have little doubt the rest are not also the 1 to 2 person (i.e. larger) heatsheet. So NOW I am just a satisfied customer. The normal price on these is 3.99 (that still seems like a good deal) but if you wait it out, you may find these on sale as I did. Good luck.
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Uh ... does anyone have a match?