Smartphones come with more internal storage these days, but sometimes that just isn't enough. For those devices with the necessary slot, a microSD card can allow you to carry a massive media library around in your pocket. You can get some of the fastest cards out there today for a nice discount. Samsung's EVO Select cards are all on sale. The smaller ones are just a few bucks off, but you save more on the larger ones.These are all Class 10 UHS 3 cards with maximum read speeds of 100MB/s and write speeds of 90MB/s. Samsung pushes them as ideal for recording 4K video, but you can use them for whatever you want. The cards come with a full-sized SD adapter, too.The 256GB card is discounted the most. It's $129.99, $20 off the usual price. The 128GB is usually $44.99, but it's $36.99 right now. The 64GB is $19.99, down from $22.99, and the 32GB is $9.99 instead of $12.99. It's wild you can get 32GB of speedy external storage for under ten bucks. Also of note: the 256GB card has free 1-day Prime shipping in many areas, so you can get it before the holiday.Source: Amazon