This Casio wristwatch, the F-91 watch, is sold in Japan for 990 yen (9 USD). It is probably sold in every other country as well.
A cheap watch like this is referred to as “Che-Casi”, (short for Cheap Casio) in Japan.
It is popular among young people.
Not only is it affordable, it also comes with lots of features.
Also, it has a battery life of 7 years. That is amazing.