If you’re lucky enough to own a smartphone with expandable storage, this SanDisk deal is for you. For a limited time, Amazon is offering the SanDisk 128GB microSD card for only $18. If you’re an Amazon Prime member, you get free Prime shipping, too.

Usually, this SanDisk 128GB card would set you back $29, so you’re saving over $11 with this deal, or 38 percent off. Not bad!

If you want to go bigger, the 256GB microSD card is also on sale for $45, which is about 34 percent cheaper than usual. However, $45 is still quite a bit to pay for a memory card, and the 128GB card is the real steal.

Whichever one you choose, the microSD card comes with a free adapter which allows you to use it in normal SD card slots. This is perfect if you want to transfer files from your smartphone or tablet to your laptop or desktop computer.

We’re not sure how long this deal will last, so click the button below to grab yours!