Amazon is offering amazing deals on SanDisk microSD cards for Prime Day. You can get a SanDisk Extreme Pro 400GB microSDXC Memory Card for just £71.99, instead of its original price of £188.99 - that's a mammoth 62 per cent off the price.

Amazon US customers have a different deal, but with the same storage: a SanDisk Ultra 400GB microSDXC card for just $44.99 - 32% off the usual price.

Amazon also has a range of other SD card deals for Prime Day including:

• SanDisk Extreme 512GB microSDXC Memory Card - save 32%, now £120.99 in the UK, $135.00 in the US: For those who want even more storage - offers speeds up to 160MB/s. View the deal on Amazon UK here and Amazon US here

SanDisk 128GB microSDXC Memory Card - save 60%, now £19.44 in the UK: This speedy card is available on a great deal for today only. View the SanDisk 128GB deal

• SanDisk Ultra 64GB microSDXC Memory Card - save 54%, now £8.29 in the UK: A great budget option if you don't need too much extra storage or the fastest speeds. View the SanDisk Ultra 64GB microSDXC Memory Card deal

All Amazon Prime Day bargains are exclusive to Prime members, but you can sign up for a free 30 day trial to Amazon Prime to take advantage. You can also cancel anytime as there is no obligation to continue. Read more about the benefits here.

Why you need an extra SD card

Considering most modern Android smartphones and the Nintendo Switch games console require a microSD card for storage expansion, with the latter nigh-on demanding one to play anything but the smallest of indie games, it's a good idea to get an SD card in order to make the most of your devices.

And that's before you get to how useful an extra SD card is for taking pictures on your camera, of course. 

A triple-A Switch game, for example, takes up between 5GB and 25GB of storage space, so getting your hands on a 400GB card means you can store around 40-50 games. If you already own a Nintendo Switch you'll know exactly how frustrating it can be to archive a game (uninstall it) just to play another.

The SanDisk cards on offer is amazing quality too, giving cool speeds. The Extreme Pro card is capable of download transfer speeds of up to 170MB/s so is superb for phones, and portable and compact system cameras too. The Ultra card is capable of speeds up to 100MB/s - still more than enough to keep your Switch ticking along nicely.

Each card comes with an adapter so you can also use it in standard SD card devices.