Amazon has a slew of different micro SD cards from Samsung on sale today, with the 32GB model priced at $10, the 64GB at $20, 128GB at $37 and 256GB is priced at $130. These are all matching all-time lows for their prices, so definitely worth picking up.
These micro SD cards all come with an adapter, so you could use it with other devices like cameras and such that use standard sized SD cards. These are also going to be great for adding more storage to your smartphone, especially if you're running out of space right now. Also great for using with the Nintendo Switch and even in action cameras like GoPro's. These all sport 100MB/s read and write speeds, with the exception of the 32GB model which is a bit slower at 95MB/s. That's still not bad, considering it is plenty of speed for recording 4K footage and also running apps/games off of the micro SD card.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap next-day shipping if you need it here extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime by hitting the link below. You'll get 30 days free (if you're a student, you get 6 months), and then it's $99/year. Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits. Remember that if you are looking to pick this up as a gift for someone this holiday season, you'll need to order it by December 18th for non-Prime shipping, and if you are a Prime member, you have until December 22nd, to get it in time for the Holidays. Amazon does also offer extended returns for anything purchased before December 31st, can be returned until January 31st, 2018.