Amazon has the YI 4K+ Action Camera with a Waterproof Case available for just $229. That's good for $110 off of the regular price, a pretty significant discount, but that is only when you use the promo code 4PV2NDFC at checkout.
The YI 4K+ is a 4K capable action camera from YI - which is partly funded by Xiaomi. It's a great action camera from the company, and the best one it has ever put out. You're going to be able to shoot 4K video at up to 60 frames-per-second. That's going to be some high resolution but smooth video for you to use when you're out on adventures. Action cameras like the YI 4K+ have become very popular in the past few years, as more people want to film their adventures, whether that's surfing, going to the beach, hiking, or something else, but they don't want to use their DSLR for that. And the YI 4K+ is a great alternative. This one in particular comes with a waterproof case, which is nice to have as you can take it into the pool or the ocean. YI also offers a slew of different accessories with the YI 4K+ Action Camera, which is also nice to have. And you can pick it up for a pretty good discount right now.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap (usually $3.99) next-day shipping if you need it extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime. You'll get 30 days free (if you're a student, you get 6 months), and then it's $99/year (or $49/year for students). Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits.