Ditto on eBay. I've been buying and selling on eBay since 1998.
If you are not familiar with eBay you need to be sure to look at the feedback percentage of the seller. There are some sellers out of China that will have hundreds of thousands of feedbacks. You can click on the seller's feedback number and look at the positives and negatives. Look at the negatives and see how many are for LEDs. Some of these Chinese companies have hundreds of products. Many, many of those negatives come from inexperienced eBay buyers.
We bought 32 flat panel LEDs two years ago on eBay for our TT that we boondock in. No failures. Paid less than $2 per panel.