For the lower prices, I think these tablets are near the best you can get. Even at the original prices they weren't bad. It's kind of too bad that we're tablet saturated in my house. I'd jump on this otherwise.
I don't know if you can install the Amazon app store out of the box, but rooting my HD+ was actually pretty easy.
You can pay $10 -$20 to have a card and everything set up for you,
OR
Here's the procedure to DIY:
Download files from XDA (
http://forum.xda-developers.com/show....php?t=2062613 )
Write to SanDisk class 4 microSD card
Put into tablet
Start tablet up
Root
Restart
It's really very easy. The instructions look a little long, but after I read them a couple times it was pretty straightforward.