Goto www.polyzone.com. They have all kinds of different plastics that are used for puckboard including UHMW which is what is used on real boxes.
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"Natural Polypropylene Sheet" .125'' 48''x96'' 35.94$
Anyone know about this stuff? It's cheap.
http://www.polyzone.com/asp/Product.asp?PG=2067
OOoh or plastic lumber. I think I've seen stuff like this, seems like it would slide OK.