I only buy from Amazon when the product isn't available anywhere else: Between counterfeit products, external vendors that I don't know how to distinguish from

I only buy from Amazon when the product isn't available anywhere else: Between counterfeit products, external vendors that I don't know how to distinguish from Amazon itself, stuff "Available in 2 days" that gets delivered 2 months later, bought reviews, strange ratings and pictures which don't natch the description — I have a 70% chance of paying the return shipment.