If you've ever shopped on Amazon, you've likely come across reviews where you may find a claim similar to "This product was provided at a discounted price in exchange for my honest review." Have you ever wondered how these reviewers got their discounted prices? Most shoppers already know about Amazon Vine, the exclusive program that provides members with a free product in exchange for a review, but it's difficult to join as it is invite-only.
What you may not know is that there are similar websites that provide you with a product in exchange for a review, and they're available for anyone to join. After registering, you'll be provided with a selection of products that are available for a discount or even free. You purchase the item as normal, but you'll be given with a code to enter at checkout that will adjust the item to its discounted price. Then you simply wait for your purchase to arrive, write a review and you'll be able to select another item.
Here's some sites where you get discounted and free items on Amazon in exchange for a review. AMZ Review Trader is the largest and most established of these sites and would be the best place to start, with Snagshout coming in at second.