Amazon Data Scraping Expert Needed

I need an experienced data scraping expert to extract and maintain a large-scale product dataset from Amazon USA, specifically for vitamins and supplements. The goal is to collect data for 2 million products across various categories and update key fields like price and availability on a monthly basis.

Data to be collected includes:
- Title
- Product link
- Product tree of category
- ASIN
- Price
- Availability
- All image links
- Description
- Product fields, etc.

Requirements:
- Handle product variations (like different sizes or colors)
- Manage CAPTCHA challenges using solving services
- Experience with large-scale data scraping
- Familiarity with Amazon's structure and data points

Please bid for each 20k products. Lower bids will be considered.