1/8 thick foam board is perfect all general photo mounting purposes or as a rigid backing board. Purchase this foam board online from
Foamboard - Black/Black - 4' x 8' x 1/2 - Set Shop NYC
9x12 Traditional Mahogany Complete Wood Picture Frame with UV Acrylic, Foam Board Backing, & Hardware - Bed Bath & Beyond - 38547292
Archival Methods Acid Free Foamboard, 17x22 1/8 Thick, Color: White, (Pack 10)
Standard White Foam Core Board (1/8in) (Not Acid Free)
Golden State Art,Pack of 200, 8x10 White Foam Board Backing 1/8
Kingspan GreenGuard 1 x 4' x 8' Square Edge Foam Board Insulation - XPS Supply
5 9x12 EcoSwift Corrugated Cardboard Pads Filler Inserts Sheet 1/8 Thick 9 x 12
3/16 Pre-Cut Foam Board Order 3/16 Custom Cut Foam Board in Multiple Sizes at Foamboards
Foam Core Board Mounting, Photo Print Mounting
9x12 Conservation Mat Board Show Kit - 25 PACK - Shop Now
9x12 Poster Stand Sign Holder Security Snap Frame 1 1/4 Wide FREE Shipping – FloorStands
Foam Core Board Mounting, Photo Print Mounting
Pop! 6mm Extra Thick Foam Sheet 9x12 - Black - Kids Foam Sheets - Kids - Joann Fabric and Craft Stores