This is usually done in InDesign if it's a batch job, Photoshop - definitely not unless it's a tiny web shop. InDesign allows you to create a print-ready PDF and the printer will know how to "step it up" (basically lay multiple on a page to save $). Your software sounds goods for people who don't do this sort of work constantly - such as schools, medium-sized businesses, etc.

Try pitching to those audiences.