I've gotten to a point where I can usually stop myself from buying new things. I'll just learn as much as I can without spending money. Then, if I finish that, and i'm still interested, I'll spend a little money. So far, my last couple "hobbies", I haven't spent anything.
But, I am 100% going to buy some drum stuff in the near future. Can't really learn drums without at least some sticks and a practice pad...and maybe a seat....maybe just a snare...and a bass drum.....ಠ_ಠ