The FireTV is one of the best deals in streaming boxes around, since it now includes 4K as well as voice support via Alexa, and the deal gets better when they mark the price down to $85!
Getting a small form-factor Windows PC is really, really inexpensive these days, and the Amazon Daily Deals makes it even more so. For example, this Dell Inspiron i3050-3000BLK Desktop (Intel Celeron, 2 GB RAM, 32 GB SSD), running for just $150 today (just add monitor, keyboard, and mouse).