Enhance your envelopes with custom printing. 1,2,3, and 4-Color offset. 1-6 color flexo or 4- color Digital. Call for pricing details now 219-730-1571. At The Envelope Supplier, our owner, Rhonda Beith, sells a vast collection supplier of envelopes, paper, and paper invitations. She stocks a great selection of unique and traditional business envelopes in store and she also creates custom-sized and custom-printed envelopes for small or large bulk orders.