I'm a teacher, so as you can guess, my budget is pretty small! I usually spend about 40 bucks a month on average, mostly on used legos. I go to a local "toy store" where the seller keeps huge unsorted boxes of Legos and sells them for $7 a pound. It's quite a job sorting through them for the pieces I want, but it keeps me within my budget. I buy new sets several times a year too, whenever I have extra spending cash.