GATOR FOAM
Great price - great value
Gator foam is an extruded polystyrene 
foam board which is a flatter and more rigid surface than foam core and makes an ideal surface when both cost and quality are a consideration.
SINTRA
Consistent edge
Sintra is a lightweight, extruded PVC (polyvinyl chloride plastic), 
with a low gloss matte finish. It has a slight surface texture which sometimes imparts a subtle “orange-peel” finish to certain photos. It is available in a variety of thicknesses including 3mm (1/8”), 6mm (1/4”) and 13mm (1/2”). Sintra’s relatively homogenous edge makes it a nice choice when the finished panel is to be floated away from the wall and the look of the edge is important.
DIBOND
Archival quality at a great price
Dibond is popular because it combines certain features of aluminum and plexiglas: it is lighter in weight than aluminum and plexiglas, and more 
durable. It is the flatest, truest of the surfaces for mounting. It is a composite sandwich of painted sheets of .012 gauge aluminum, with a rigid polyethelyne core. It is extremely stable, resisting bending and warping over time, and may be exposed to extreme temperatures without affect. From the edge, the sandwich of 2 sheets of aluminum and black plastic core are visible.
ALUMINUM
When only the best will do
Aluminum is available in a standard finish. It is offered in 1/16” thickness, and is stable, considerably lighter than plexiglas, and will not crack or change with variations in temperature or humidity. In order to keep the panel flat we highly recommend a cleated back frame. Aluminum mounting produces the most unobtrusive edge of all the substrates.
BAMBOO
For something out of the ordinary
When you're looking for something a little more unusual bamboo may be just what you want. Photographs are mounted to 3/4" thick bamboo panels and are finished with a keyhole slot in the back for easy hanging. The distinctive edge pattern of the bamboo is revealed on the sides.