I've been using Profit Scraper for the last 3 months and making good traction at the moment. Currently selling 30 items a day with profits in the region of £750-£1000 per month. I've written about the first 7 weeks of my experience and highlight a few ways to increase profit margins. Let me know how you get on. https://www.thriftypence.com/retail-arbitrage-a-guide-to-amazon-to-ebay-arbitrage/
Here's more helpful info:
You can use ShopMaster(shopmaster.com) import product from Amazon into eBay store. And It can help you create Listings from different channels, like eBay, Amazon & Shopify, and then list the Listing on your store easily and quickly. You can get started with the FREE Starter Plan at now.