Fitbit Flex 2
Everyone could use a fitness tracker, and the Fitbit Flex 2 is a great one to pick up. Coming in at under $100, the Fitbit Flex 2 is waterproof and can track your swimming, as well as being able to track other exercises. One thing that it cannot do, however, is track your heart rate.
Amazon Fire TV
One of the best set-top boxes out there. The Amazon Fire TV is available for under $100, and also has 4K content from Amazon's Instant Video library, as well as YouTube, Google Play Movies & TV and many other apps. With the Amazon Fire TV, you can also play games on the big screen.
Bose SoundSport in-ear headphones
These are Bose's SoundSport headphones and they are exactly what the sound like. In-ear headphones that are made for the gym. These are not their wireless version, but these are under $100 and use a 3.5mm jack as well. So you'll want to make sure your phone has a 3.5mm headphone jack before picking these up.
Amazon Fire HD 8
This is a great tablet from Amazon. It's their 8-inch tablet, which actually just launched a few months ago. It has an improved display, better graphics and even better battery life. But it's still under $100, which is pretty impressive to say the least. It's a great tablet for getting some reading done, but also great for playing games on the go.
Amazon Fire HD 6
Looking for a somewhat smaller tablet? Then check out the Amazon Fire HD 6. As the name notes, this is a 6-inch tablet, but still pretty amazing for what you're paying for. It's the smaller option, but not the inferior one. You can still play your favorite games and install all of your favorite apps on the Fire HD 6.
Moto G4 Play
A smartphone for under $100? Yep. The Moto G4 Play is available just under $100 from Amazon, but that is with ads. You're looking at a slightly higher price without them. The Moto G4 Play is a pretty fantastic smartphone for the price. It's definitely not going to compete with the Galaxy S7 Edge, but it isn't meant too.
BLU Energy Diamond Mini
Is there someone on your list this holiday season that needs a phone with a huge battery? BLU has you covered with the Energy Diamond Mini. It's a smaller smartphone, but has a pretty large 3,000mAh battery inside. We're looking at a 4-inch display with 512MB of RAM and 4GB of storage, definitely a low-end smartphone, but still very capable.
Roku Premiere+ Streaming Media Player
The Roku Premiere+ is another great streaming media player. It does also support 4K content, from the likes of YouTube, Amazon and Google Play Movies & TV. It does also include some games, although they aren't as robust as what you'd expect out of the likes of an Amazon Fire TV Stick since that runs on Android.
This is a car adapter that works in the OBD-II port of your car. It's pretty sweet because you are able to get all kinds of data from your car onto your smartphone. Including alerting you to your Check Engine light being on. And more importantly, it tells you why – in plain English – the light is on. It also works with Alexa, which is found in the Amazon Echo.
UE BOOM Wireless Speaker
The UE BOOM is another great Bluetooth speaker to pick up, under $100. It produces 360-degree sound, and has some incredible battery life. We're looking at 12+ hours. Additionally, you can pair it with other BOOM speakers and create surround sound in your home. Which makes it even more incredible.