Nintendo of Europe states that NES Classic Edition will "continue to ship to retail units on a regular basis"

The following statement comes from a TechRadar interview with a Nintendo of Europe representative:

Production for the Nintendo Classic Mini: NES continues, and NOE [Nintendo of Europe] will continue to ship units to retail on a regular basis.

So, if you are still waiting to purchase an NES Classic Edition, there may still be hope yet! If there are any further announcements regarding the product, we will be sure to announce them here on the site!

from GoNintendo