The Nintendo Super Mario Bros. Game & Watch will soon be discontinued. Nintendo only released it on a limited run, as part of the Mario 35th anniversary celebrations, and will no longer supply it from 31 March 2021.
You don't have much time to get hold of one, therefore.
Luckily, it's still available in a few places and some are even offering healthy discounts. Amazon, for example, has it for less that £30.
Game & Watch: Super Mario Bros (Nintendo)
Released in November, the Nintendo Game & Watch: Super Mario Bros. special edition handheld looks and feels like a classic 80's Game & Watch - even including a Mario version of the mono "Ball" game so synonymous with the period.
However, it actually comes with a full colour display and will also run the NES classic Super Mario Bros. and Super Mario Bros.: The Lost Levels (otherwise known as Super Mario Bros. 2 in Japan).
You also get a digital clock - after all, it wouldn't be a Game & Watch without the "watch" - although even that has Mario jumping around the screen.
Nintendo also limits the releases of other Mario games and products until the end of March, with the Nintendo Switch collection Super Mario 3D All-Stars only available in its current form until the end of the month.