If you're only doing that many cakes a month it's probably best to get them at your local cake supply store or whereever you can find them cheapest. As with other products you'll find the more you order the cheaper they are. I buy mine by the case at Sugarcraft. It's much cheaper for me to do that.
Also, you may want to check and see if there's a local cake club in your area....you could post a thread and ask. There's one in my area and the president told me they (the members) order in huge quantities every so often and split the order up when it arrives! I may go in on that the next time they place an order!
I dont do a lot either, but i just bought a bunch from a online place, much much much cheaper than the wilton boxes. I figure they will just last me awhile!
http://bgpaper.com/Catalog/Baking_Supplies.html
Quote by @%username% on %date%
%body%