Digital BW, The Print

A  business associate had some of my prints mounted on a rigid substrate at 
Costco.  She doesn't know how it was done, but I must say that I was 
impressed with the overall look.  The finished product is about 3/8ths 
thick and the image is overlaid with a tough plastic coating.  It appears 
to be an excellent alternative to framing gift prints.

Does anybody have any further information on this process?  How large a 
size can they deal with, for example.

Peter McLennan