3 ply 16x18's are getting harder to find and they might become the new 14x14's
I'd suggest getting the one for $60 and have fun stripping it from the paint. It is not that bad and you save $65...It all depends how much paint its in there. Some old paint can be even scratched off with your nail tips!
Paint stripper, gloves, and some music on the background works wonders! Make sure you work on an open place. The smell is not good and the stipper fumes could be hazardous...