Selling prints, different sizes & prices w/o diff product pages

I am a photographer trying to set up a site to sell prints from. I have run into a problem with all of the e-commerce plugins that I have tested out so far though. They only allow for one price per product. Sure, I can list different options for a product (like small, medium or large), but I need to list each option as a different price.

Every one of my prints would ideally be offered as, for example, a 5×7 at $20, 8×10 at $35, 11×14 at $50 and 12×18 at $60. I want all of these options to be available from the one product page – not 4 different product pages for each photo.

I have read an excellent tutorial on exactly how to set this up but thought that maybe there would be a less cumbersome way to approach the problem.

Any ideas?