I recently took up drumming. We already have an electronic drum kit from the kids so that's saved a few hundred quid, and just leaves £20 a week for lessons. I'm loving it, and you get quite a lot of lessons for the cost of a 4090FE
OTOH for my other hobby, I recently put petrol in the car and like an idiot drove off with the petrol cap sat on the roof. That's a locking race spec flush fitting petrol cap, £120 delivered. Expensive hobby to make mistakes in