Need an e-commerce plugin that allows product duplication and price variations

I’m having ‘e-commerce plugin headaches’.

All I want is a plugin that allows me to list several photographs that I want to make available as variable sized prints. And then have the user decide what print they want and at what size. I also need the ability to duplicate a product, because if I have 10 prints but the sizes and costs are all the same apart from the title and photo, then it would be ideal to be able to avoid re-inputting the sizes and costs for every photo.

For example :

My Photo 1
A4 Print = £30
A3 Print = £40
A2 Print = £50

User adds A3 Print to cart and checks out with Paypal

My Photo 2
A4 Print = £30
A3 Print = £40
A2 Print = £50

User adds A3 Print to cart and checks out with Paypal

And so on…

For the pricing system, I found MarketPress Lite that was ideal for everything…except I couldn’t see how to duplicate products and all their individual variations of size and cost.

So then I found JigoShop, that looked great too (http://jigoshop.go2cloud.org/SH1S). Except the duplication facility is by way of extra plugin and costs more money.

I tried one or two others as well but they didn’t allow the functionality I needed.

So, does anyone know of a free plugin that is often used by photographers to allow users to order prints of various sizes and prices online, ideally with the ability to duplicate product listings?