You can import Amazon fulfillment products into your Magento store with Amazon Products Manager Magento Extension.
It can be set to import only Fulfillment by Amazon (FBA) products from Amazon. After product is purchased in your Magento store you can reorder it in Amazon easily using Amazon fulfillment service.
Navigate to Magento admin Panel-->System-->Configuration-->Amazon Import-->Search and Import settings tab. there is Include only items sold by Amazon parameter. Set it to "Yes" value.
Check the Magento admin Panel screenshot below.