Check & Revise Pricing on 2815 Wordpress Products & Variations

Our website currently has 2815 product listed, many with variations. These items are all sourced from amazon.ca prime, and many of the prices and availability have changed over the last year. We need you to check availability & pricing for each of these items; adjust pricing with 15% markup, OR find a substitution product OR put out of stock. This is fairly straightforward but time consuming. Most of the products are still available but many prices have changed; some are no longer available; we need to update all of it. Ideally you will work through a number of products at a time (say 300) and then we release a milestone. Note we have several other websites which need updating as well, if this goes smoothly and quickly, we would be happy to use you for our other websites as well.