Here's an updated list of all the stores that we support for 1-Click Product Importing: https://app.dropified.com/pages/source-import-products
Currently auto ordering, fulfillment and synchronization is just with AliExpress, Alibaba and eBay. (For Alibaba make sure to set that up here.)
If you have a private label plan such as Private Label on Demand or Dropified Black, you can preview our product selection here - https://www.dropified.com/catalog/