If you have a PC in your living room, or you just need a compact keyboard and mouse combo, Logitech's K400 series has always been a great option. I bought the original K400 several years ago for use with a Raspberry Pi, and it still works perfectly. For the rest of today, or whenever stock runs out, the K400 Plus is just $17.98 from Amazon. That's around $10 lower than the usual price.
The K400 Plus is a small wireless keyboard, with a 3.5-inch touchpad on the right side. As you might expect from the $20 price tag, this is a membrane keyboard, not mechanical. It has a wireless range of roughly 10 meters (33 feet), and it uses Logitech's Unifying USB receiver. No messing with Bluetooth—just plug and play.
The major downsides to the K400 Plus are the lack of backlighting and the somewhat-small key layout. Still, the keyboard offers a lot for $18.
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