I don't have a certain number when saving up, but I figure I can get by on this:
Hotel: $0. I'm lucky, and my mom pays for the hotel room. I know that there are some hotels for $70 or so nearby, so if I needed to, I'd pay that.
Gas: $0. My mom ALSO pays for gas because she goes to Rosemont to visit a friend who lives nearby, and there's no need for me to pay for it.
Food: I really don't need to eat anything besides dinner (I just don't get that hungry), so maybe $20. And that's just to be safe. I eat random snacks I bring with me here and there (some trail mix or chips periodically), so I don't feel bad during the con. I recommend that others bring about $60 or so, just because food can get expensive in Rosemont.
Other stuff: I'm bad in the Dealer's Room and Artist Alley, so I bring anywhere from $200-$400. I can't be sure if a figure or plushie I buy online is legit or not, so I don't buy those except at ACen. Which causes me to spend more than I probably would online, but at least I know what I'm buying is real. I see so many knock off items on Amazon and Ebay that I'm afraid to buy any figures online. ^^;. I also didn't have much access to buying other merchandise until recently, so I had to buy it all there. Now that I do, though, I may spend less. XD. But it's typically around that amount.
And I think that's all. I may bring extra money, in case something happens, but that's all.
This post has been edited by Fate Averruncus: 11 April 2013 - 08:29 PM