Very nice work there. Could you share the name of the fulfilment company (or a similar), Google gives me here some rather traditional results. Outsourcing support would be of great help.
I'm using PrintNinja (http://printninja.com) - they also do the printing for me, and they've been phenomenal. Great quality, reasonable prices, absolutely stellar customer service. The fulfillment is relatively new, and they're still working out the kinks, but I really like working with them so it's nice having only one company for both aspects.