It seems iPad mini with retina displays are quite plentiful in some areas. I saw a huge stack in Target, Best Buy, and quite a few people buying theirs when I used Personal Pickup for mine today.
It's a bit disappointing that the burn in display problem is so noticeable, but I'll replace it as soon as Apple gets the issue resolved.
At least it's better than the dreary display my first mini had. It may be that Apple and their suppliers are too busy to meet demand and quality under current conditions. It's just how it is.