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look at the phone book for plastic company, you should be able to get a sheet of 4x6 from them. http://www.regal-plastics.com i get my from them, but they are located in TX.
Hodge if you live near a larger city/town look in the yellow pages for plastics. Shipping on sheets is very expensive. Depending on the use it will depend on the tickness and type of acrylic to use (extruded or cell cast). What are wanting to use it for? My costs here run from $90 for 1/4" for an extruded 4X8 sheet to $130 for 1/2" cell cast 4X8 sheet. I'm sure your local place will cut it for you if you cannot. A table saw is a must for a good square cut.