Amazon is currently selling the SanDisk 1TB Extreme Portable SSD for just $199. That is actually good for a whopping $150 off of the regular price, and does also bring it down to an all-time low. The 1TB capacity had been on sale before, but only to about $249, while the 500GB capacity had gone on sale to as low as $99 (it's currently $109). This is a really good portable SSD to pick up for anyone that needs a bit more space on their computer, but don't want to deal with wires, or slow HDD drives.
The SanDisk Extreme Portable SSD is a very small and portable SSD that you can use to store all sorts of files on. In most cases, it is smaller than your smartphone. That means that it can fit in your pocket quite easily. The SanDisk Extreme also has a loop and comes with a carabiner clip so you can actually put it on your keychain. Now it is a bit big for putting on your keychain, but it can be done. This is a USB-C portable SSD, and it does come with a pretty short USB-C to USB-C cable as well as a USB-C to USB-A cable so even if you have an older machine that doesn't have a USB-C port, you can still use this portable SSD. It sports up to 550MB/s read and 500MB/s write speeds, which you likely won't actually see, unless your computer is capable of reading and writing at that speed. But that is still plenty fast for moving big files from your computer to this SSD, and vice versa. That puts it just a tad faster than the Samsung T5 which is a crowd favorite, and has 540MB/s read and 500MB/s write speeds. That difference is really not noticeable and shouldn't affect your buying decision though.
What sets the SanDisk Extreme Portable SSD apart from others out there, like the Samsung T5, is the fact that it is rugged, hence the "extreme" in its name. To be part of SanDisk's "Extreme" lineup, it needs to be able to withstand some drops, being tossed around, and even some water. This portable SSD is rated at IP55, so it's going to be able to get wet, but it is not waterproof. So if you spill some water on your desk, the SanDisk Extreme Portable SSD is going to be just fine. SanDisk offers the Extreme in four different capacities: 256GB, 500GB, 1TB and 2TB.
This 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. However, if you are in one of the select areas that has Prime Now, this is also available and you can get it within a couple of hours, if you are in desperate need. 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 $119/year (or $59/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. That includes Amazon Prime Video, Twitch Prime, and even some benefits at Whole Foods.