Running. You are your equipment, and you can do this sport almost anywhere. Walking is also cheap, but a less popular sport.
I would like to add that walking is probably the most beneficial exercise sport there is. Easy on the joints and muscles and very aerobic without being burdensome on the respiratory and cardiac systems.
marbles, which is actually a sport
its cricket
Research :/
bananas are the least expensive and most popular fruit.
Bugatt Veyron Convertible
advice
There are many cars that are considered to be expensive, but the most expensive cars include and are in the order of most expensive to least expensive, Lamborghini Veneno, Lykan Hypersport, and third the Veyron Super Sport.
Seal clubbing.
Seal clubbing.
The most expensive fondue in the world is about 80 dollars. The worlds least expensive fondue is about 35 dollars.
Brazil
It might be Formula 1 racing. There are not many teams because few can afford to "play" at this sport.