Just go to your local carwash or laundry cleaner. They will give them away. I get mine from colonial chemical in Tabernacle just down the road from you. They gave me several sizes for free.
E-spec has them $60 or $80. you can get the hole set up from water cannon. It comes with a surflow pump, 20 gal. tank and wand on a cart for $189 plus shipping.