Well, depends on your definition of not costing much. I walk and hike but when you get to the levels I do, you tend to buy new shoes every couple of months. The rollerblading was cheap in that once you have the equipment, you are good for sometime. Biking, again, once you get to the level we do, you have to keep buying tires and the initial expense can be fairly big.
Board games are fun with the spouse, reading books from the library is economical and you can learn about various things. I plan to do container gardening this year since I have a huge balcony but no yard and seeds are cheap.
Hmmm.....I think the rest of my hobbies are too expensive to list other than the obvious learning how to budget.
