The cork tile works okay, and comes in standard-sized squares, but it probably won't last as long as virgin cork because the glues, etc. in the backing will degrade over time. For virgin cork bark I've found First Rays to have some of the best prices and cheapest shipping. Depending on where you're located you may also have some freely-obtainable woods that work well for mounts; I've used red cedar, crape myrtle, and rhododendron with good results. Hope this helps!