Looking for Free web service of product data [on hold]

I'm trying to rapidly prototype an e-commerce UI and need a decent sized feed of product data with images to query (using jQuery preferably).

Does anyone know of any free Sandbox web services or similar that I can query without wasting hours creating a database with products locally?

I found this question here on SO but it didn't really help:

Looking for a list of free data api's and web services

Cheers.