Where can i find cellophane and cardboard for a fine art print?

If the print is a high quality print,printed on acid free paper it would be a good idea to use an acid free board for mounting. This can be obtained from art suppliers and frame shops. Plastics,in different mils or thicknesses, to wrap the work in can be found at some fabric stores but should only be used temporarily because heat will effect the plastic and cause it to shrink in turn bending or warping the board and print. Cellophane might be found a some art suppliers as well.