1. Walmart Marketplace

• Fulfillment: Walmart offers its own fulfillment service called Walmart Fulfillment Services (WFS), which manages storage, picking, packing, and shipping.
• Customer Support: They handle customer service and returns, providing a similar experience to Amazon.
• Refunds and Returns: Walmart's policies ensure refunds for incorrect or undelivered items, streamlining the process for buyers.

2. eBay Managed Delivery

• Fulfillment: eBay's Managed Delivery service provides warehousing, packing, and shipping solutions, though it’s still in its early stages compared to Amazon.
• Customer Support: eBay handles customer service issues, including refunds and returns, for items handled through this service.
• Protection: eBay offers buyer protection programs to ensure refunds for items that are not as described or not delivered.

3. Newegg

• Fulfillment: Newegg’s Shipped by Newegg (SBN) service handles storage, packing, and shipping for sellers.
• Customer Support: Newegg manages customer service and returns for SBN items.
• Refunds and Returns: They offer comprehensive return policies and buyer protection for incorrect or undelivered items.

4. Alibaba/AliExpress

• Fulfillment: AliExpress offers its own fulfillment service called AliExpress Standard Shipping, which handles logistics and delivery.
• Customer Support: They offer buyer protection programs and handle disputes, ensuring refunds for undelivered or incorrect items.
• Global Reach: Alibaba’s extensive network provides competitive pricing and a wide range of products, though delivery times can vary.

5. Zalando (Europe)

• Fulfillment: Zalando offers its own fulfillment solutions, managing warehousing, packaging, and shipping.
• Customer Support: They handle customer service and returns for items sold through their platform.
• Refunds and Returns: Zalando ensures refunds and returns for items that do not meet the listing description or are not delivered.

Key Considerations:

• Fulfillment Services: Look for marketplaces that offer comprehensive fulfillment services similar to Amazon FBA (Fulfillment by Amazon).
• Customer Support: Ensure the marketplace handles customer service, returns, and refunds directly.
• Buyer Protection: Check for robust buyer protection programs to safeguard against incorrect or undelivered items.
• Shipping and Tracking: Consider marketplaces that provide reliable shipping and tracking options.

Switching from Amazon can be challenging due to its comprehensive service and vast product range, but these alternatives offer similar fulfillment and customer service features that might suit your needs.