I would say about under $20 at my home park if its another park wich i have to pay admission for after admission its easly over $100 or around there. then food and everything else about $200 but i treat myself wellso i gusse thats why i spend so much.
At my home park I usually spend about $7-10, admission being with my pass. At parks I go to annually, like CP, usually around $20. First time visiting in awhile I spend quite a bit on memorabilia and such; probably around $50, which for a not full-time job teenager, is a lot!
------------- Life is a roller coaster...enjoy the ride!
I used to spend 15 bucks or so. But lately, since I am at Disneyland every week, I spend from 0-10 bucks. Last week I went to AM PM (a mini mart). Got a 44oz soda for 77 cents. My totaly spendings was under 4 bucks. I think I will go there more and save money.
Last night at PKD I only spent 1.05 on a Hypersonic souvenir cup.They were having a sale at one of the shops near the ride.My friend however spent about 16 bucks or so buying 2 copies of the Hypersonic on ride photos,one for each of us.
If we don't count admission (since I have season passes at 3 of the chains), then typically $20 or so. Obviously this figure is higher at parks were I need to pay admission and/or parking, and varies by how long I'm at the park (cash spent at SFWoA this Friday night: $0. Cedar Point on Saturday, including a VertiGo shot: $50)