Source: https://www.reddit.com/r/pcmasterrace/comments/4v5dqd/if_you…
I caught wind of this from our friends over at /r/buildapc and tried it out for myself tonight. I bought my 970 a couple months ago and was eligible for the 20% to be refunded to my credit card no questions asked. If you have purchased through Amazon take a minute to do this for yourself.
I've also heard that if you ask for a return amazon will refund you 100% of your purchase price, but I'm happy with my card and won't be taking advantage of that.
Here is a screenshot of my conversation a few minutes ago: https://imgur.com/1nxiSju
Hmm, I bought 2 for sli setup back in 2014. checking to see if I'm eligible now
Amazon.com for me
regardless, thanks for the heads up OP :)