30 days ago you could buy any GPU for close to MSRP. Amazing what difference a few weeks make. According to Angry Chicken's last video on Youtube the shortage is due to Nvidia's manufacturing shifting to the new Volta GPU's. It may be a rough couple months until the new line is released. I also got a feeling the current price run up is going to lead to sticker shock once the new GPU's are out due to increased manufacturing costs from the smaller 12 nM process for Volta.
https://www.youtube.com/watch?v=Op3h_bV3ohA 40 days ago more like, and ONLY on the Nvidia side - AMD cards haven't been close to MSRP (except Vega) since spring, and the Vega low prices evaporated before Thanksgiving when the "killer on Monero" guides got widespread.
I don't anticipate a huge price jump on MSRP for the Volta cards - we didn't get one from Maxwell to Pascal after all, despite 28nm being a MUCH bigger jump on cost to 16nm vs 16nm to 12nm (which is the same NODE, just upgraded on the process and misnamed).
I DO anticipate a 10-15% jump due to the move to GDDR6 and memory pricing jumps in general, and won't be shocked at 20%.
Here is archive.com's snapshot of Newegg's GPU page from 12/31. You could buy just about any Nvidia card for close to MSRP and they were in stock, albeit 1 per customer in most cases.
https://web.archive.org/web/20171127075041/https://www.newegg.com/Desktop-Graphics-Cards/SubCategory/ID-48The last AMD RX 580 8GB I bought was in the middle of last month for $279 which is ALOT closer to MSRP of $229 than the $500+ they are now.
Your link is showing a date of 27 November, not 31 December.
I don't count a 22% premium OVER MSRP on a card that was seilling 10-11 months ago for UNDER MSRP as being "close to MSRP" - closer than now certainly, but not really "close".
It's starting to look like the PRIMARY cause for the current shortage was timing on Nvidia's part, in having TSMC shift from Pascal production to Volta production "around the end of the year" and RIGHT AFTER the busy Christmas season.
For a change, Nvidia ran out FIRST then the gamers started grabbing AMD cards 'cause they were still available - and a week later POOF both sides have run out of inventory at the retailers and stock in the pipeline.
I suspect demand drop on the mining side isn't that big of a factor, as I don't think it was much of a factor in CAUSING the current shortage.
Nowadays you can make more money by selling your rig(s) then the rig(s) can mine ^^ 
