When it comes to storing files on your mobile device, having a 128GB microSD card is the Holy Grail. It's the easiest way to store all the things without having to worry about staying in range of Wi-Fi or burning through limited data allotments. So it's with that in mind that I direct your eyes over to TigerDirect.com. The site is currently offering a 128 microSD card for 79.99, down from $129.99 after instant savings. Shipping is free.
If 128GB is overkill, there's also a 64GB card for $29.99 and a 32GB one for $14.99. If you want to go even lower, there's 16GB for $9.99. For $1 less you can get an 8GB card, but why? These prices take effect after you apply a coupon code, which is supplied on each page.
TigerDirect is also selling a 256GB flash drive for 79$ (after coupon). It won't plug into most Android devices, but you can still stick it into a router or computer somewhere and turn it into cloud storage.