Sheet Cakes for The Wedding

I am getting married in 2010 and I am shopping for my wedding cake. I went to a bridal salon yesterday and just found out wedding cakes can be so ridiculously expensive. Now, I am thinking of getting a small and nice wedding cake and pairing it with a cheaper sheet cake. My plan is to the small and nice wedding cake for display, and the sheet cakes will be in the kitchen or backstage. Once we cut the nice cake in front of the guests, the caterer will rush all the cakes in the back for cutting. I think this is really cut out cost for the wedding cake since sheet cakes are usually less expensive. My concern is to find get the small cake and the sheet cake that has the exact look (same color for cake and icing) to make is less obvious. Do you know any pastry shop that can do this (and at a reasonable price of course :p) ?

aliceyyb in Quebec (including Montreal)