you'd need a card reader for whatever type of flash card your M3 uses. If you end up getting the M3 miniSD you'll need a miniSD flash card and a reader for it. If you get the M3 Lite you'll need a microSD card and a reader for that.
Both miniSD and microSD cards usually come with an SD-sized adapter to fit into the SD card reader.
Can't help on the suppliers, I'm in the US
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