3-up on a 4x6 business cards

[RobTesnear]

Hoping to have my 3-up on 4x6 cards printed on a more firm, matte paper than my typical proof photo paper to be more like the firmness of a standard business card (or similar). Anyone else do this and if so where do you get the firmer paper prints? No problem (relatively) with cutting. The proofs I get aren't stiff enough and feel flimsy/cheap for use as business cards.

Thanks all,