I have coded my own dropshipping software
1. Downloading items from amazon
2. Upload to ebay
3. Detecting prize changes regularly and updating ebay accordingly (have a few clever methods for doing this)
4. Automating amazon purchase & delivery when ebay item is bought
However I have reached my limits in terms of time and functionality.
I could definitively do with help from an experienced head to improve the method and make it more scaleable and we could share the profits.