Inexpensive tablet to play the game on?

I play on a Samsung Galaxy Note 10.1, so I can't give a personal opinion about the Amazon Fire. My sister plays TSTO on her Amazon Fire, and she really enjoys it (her first tablet). I know that the Amazon store is limited in games that you can download, as we just got my husband that tablet on Prime Day for $33 - I think, but it DOES have TSTO. He said that he is very impressed with the quality & speed of the Amazon Fire, especially with the price. We just got the 8 gb Fire tablet, but you can insert an SD card and save downloaded apps onto your SD card by following the instructions under the questions & answers on the Amazon Fire tablet page. Anyway, it's now $50, but I don't know that you could get less expensive than an Amazon Fire tablet.