Someone said the games on the nations best selling console of 2017 seem to cost a few quid and aint cheap? Your gonna want to keep those cartridges safe I suppose anyway ;)
Hori are an excellent brand and made great accessories for the Wii U, and 3DS, including the brilliant 3DS 24 Cart case. Great value for under a tenner!
* Store up to 24 Nintendo Switch game cards
* Compact and portable
* x2 Micro SD cards storage slot
* Officially Licensed by Nintendo
Also covered by Amazons Pre-Order Price Guarantee.
The black one (looks grey?) looks like it nicely matches the Grey Switch bundle. Or you can also choose a transparent colour case: https://www.amazon.co.uk/HORI-Switch-Game-Card-Case/dp/B01MTA4YMQ/