De Mambo for Nintendo Switch is currently 66% off on the Japanese EShop, making it ¥500/$5.70 instead of the usual ¥1500.
The discount seems to be exclusive to the Japanese eshop but since the Switch is region free and the game has English language options it might be of interest to some people.
Tempting, but I also don't wanna have to go through the bullshit of dealing with the Japanese news section. Getting rid of that lost all my play times :/