Amazon currently has the SanDisk Ultra 200GB Micro SD Card on sale for just $66.06. That's a great price for this micro SD card, seeing as it is typically around $100 a pop. So that's a great price to add some more storage to your smartphone.
The SanDisk Ultra is a 200GB micro SD card from the king of memory products. This is part of SanDisk's Ultra lineup, which means you're getting some fast read and write speeds here. We're looking at 100MB/s on both ends, and there is also A1 support here. This means that you can store apps and games on your micro SD card without them loading slower then on the internal storage. This is why Adoptable Storage sometimes seems slower with other micro SD cards, because it's not using the A1 standard. With 200GB of storage, you're going to have plenty of space for storing music, movies, pictures and more. Some phones do support Adoptable Storage - mostly Motorola devices - while the others allow you to store media on them. This micro SD card is going to work great on the Samsung Galaxy S9, Galaxy S9 Plus, HTC U11, Moto G6, Moto Z2, OPPO R15 Pro and many other smartphones. Basically every smartphone other than the Pixel and iPhones have micro SD card slots these days.
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.