Excellent illustration of the point I was trying to make. The Amazon quote of $54.88 for a half sheet is slightly more than double the price of $54.00 a full sheet, from the authorized dealer:
A while back - about 2 years ago I think - I bought a 4-pack of full sheets, and got free shipping from the dealer. I'm not sure if that's a standing policy or a once-in-a-while perq, but...it's what I experienced. I still have about a sheet and a half. It's really nice to just have some on hand, for when the spirit of Mr Jones moves me...