Where can I find a shopping/product price API?

I was looking to do queries on the same set of products (~100/weekly) of their prices. I've looked at Amazon but it requires you sell something every 90 days. I've tried Google, but their shopping API is similar (expects you're selling something, not looking up for reference). Of course, scraping is an option but I'm sure I'll run into CAPTCHAs and I treat that as a last resort.