This is classic affiliate marketing. You can even see the affiliate IDs in some of the links posted in this thread (look for something like AFID at the end of the url). A sales letter made to look like a review is affiliate marketing 101. Given that the value of this light is only a few dollars, and yet often sold as high as 50 something dollars, the vendor can offer some very juicy incentives to an army of affiliate marketers. So the vendor is probably making heaps of money, while individual affiliates will make as much money as their marketing skills will allow.
In the past I would copy affiliate ID numbers from links in spam emails, and report them to the affiliate vendor for spamming. Depending on how shady or legit the vendor was, they would occasionally suspend the offending affiliate for violating their TOS. A vendor which sells dollar store lights at a premium likely falls on the shady side of the spectrum, and complaints would likely get no response. However, a big name threatening a copyright infringement lawsuit might get them to take action.