I just got an email from shopto saying they’re taking pre-orders for the Mario Kart Booster Course Pass for only £16.85 which is quite a bit cheaper than buying directly from Nintendo.
If you’re in the UK and are interested here’s a link to the store page: [https://www.shopto.net/en/ndo10009896-mario-kart-booster-course-pass-p1164591/](https://www.shopto.net/en/ndo10009896-mario-kart-booster-course-pass-p1164591/)
I’ve just ordered it myself so I just need to buy the main Mario Kart game now – I already own it on WiiU so it didn’t seem worth buying again before all the new courses were announced.