The three biggest challenges for me have been: - Marketing - Finding a shop which produces at acceptable quality - Finding the balance between order volume a

The three biggest challenges for me have been: - Marketing - Finding a shop which produces at acceptable quality - Finding the balance between order volume and cost If you're not fussy about physical characteristics (eg, rounded corners) then I'd prototype at the local office max - pretty affordable and fast. If you email me I can maybe give some more details! Maybe I should start a business doing print shop consulting...