♫ And I don't want the world to see me
'Cause I don't think that they'd understand
It varies greatly from con to con, depending on my own circumstances.
At MetroCon, I paid 70 USD for con tickets, masquerade tickets, and my share of the hotel room. I purchased all my food for the weekend prior to leaving for Tampa with my EBT card, and I didn't buy anything while I was there. (Then later the friend that I paid for the hotel room etc told me he wasn't gonna cash the check, so it was basically a free con).
For YaoiCon, it cost about 400 USD for plane tickets and my share of the hotel room. Then con passes were 55 USD, and food cost me another 15 USD, plus I got one souvenir that cost about 10 USD. So that's 480 USD for a weekend.
Those are the two extremes, though. Usually I manage to keep it around 50 to 100 USD, depending on where I'm eating and sleeping (if it's close enough to home that I can eat/sleep there, cost drops a LOT).
When everything's made to be broken
I just want you to know who I am ♫