Actually if you buget right you can do it for between 400-600 dollars. Worse comes to worse.if you can't afford to buy anything that weekend you can always get a business card or a URL for a web site of any dealer there. Also just like many other conventions deals are to be had not only the last day of the weekend but they also have early bird specails on Saturday that give you first shot at whats new. This year I volunteered to help with the make and take for the whole weekend and it was worth it. For doing that I got a free weekend pass and I used that cash to go towards the early bird pass on Saturday. The Executive West Hotel has a breakfast Buffet that runs from 6am-9am I think and anyone that knows goes there to eat all they can for around 8 or 9 dollars. There is also a Macdonalds a few bolcks east of the hotel and it's open 24 hours a day. Here is a link to the Wonderfest page for this year on Starship Modeler where you can get a better idea of how it can be done fairly cheap.
http://www.starshipmodeler.net/cgi-bin/phpBB2/viewforum.php?f=62&sid=9e8743c388e7dad8f14059e87c093257