Anker has discounted its pretty beefy, and popular, PowerCore+ 26800 PD Battery Pack, to just $99. That's only down $20 from its original price, but it does bring it back down to its all-time low, which is definitely a good thing here.
The PowerCore+ 26800 PD is a pretty impressive battery pack here. As you can likely tell from the name, it does have a ton of capacity, at 26,800mAh, which is going to be enough to keep your smartphone fully charged for a few days. But it also has PD or Power Delivery over its USB-C port. What this means is that the USB-C port can do both input and output. So that you can charge your Nintendo Switch or MacBook Pro using the USB-C port and it'll be the same speed as if you were using the wall adapter that came with that device. As it can do up to 60W of power. That's pretty impressive, but that is also why this battery pack is so expensive. So if you do have a gadget that uses USB-C, and it's larger than a smartphone, this is definitely the battery pack worth picking up right now. Anker isn't going to have it discounted forever, so you're going to want to pick one up now before it's gone.
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.