I ended up going with the RCA model posted by JohnC_21. The LastPass issue was that I had to enable it to complete in Accessibility Options. I may install the Kindle version that allows you to copy and paste. Worst case I can bring it up on my phone and type it in with the keyboard.
It is working fine for the Prepd app, other than the app not rotating so I have to stand it up on its side, easy enough with the keyboard attached. I've switched over to it from the Kindle Fire HD. Having the attached keyboard makes entering text much easier.