E-readers are getting cheaper!

When I bought my basic Nook e-reader, it was cheaper than the Kindle, although I don't recall how much cheaper.  There seemed to be more Kindles around at the time, and that's what I would have purchased; then a friend gave me a heads-up:  With Nook, you could get books from the library.  Not so with Kindle.  
Since I don't have a lot of resources for book-buying, that did it for me.  I wanted to be able to read library books on my reader.  I have read a lot of library books since I bought the Nook.  
Now I see that the Kindle can finally be used to check out library books.  
Here's the real deal-breaker:  You can buy the basic Kindle for $79.  
The cheapest Nook is $139.  
If I were buying an e-reader today, guess which one I'd go for?  
It's nice to know that if something ever goes wrong with my Nook, I can buy a Kindle for under $100.