Lots of good tips here, like bring your cash in advance cause you can't count on the close ATM's and you'll lose too much time going to far ATMs.
Also, will you have a trustable pal/family with you? They can hold your money and give it in installments, if you don't trust yourself for impulse buying.
I could trust myself and bring $600, and I'd usually spend half that or less.
Also, make a list of your most-wanted toys to buy. Some of these may be available pre-TFcon in the Buy/Sell threads; so you make the deal, then meet at the event for the actual purchase. That can save you alot of time serarching, and leave you with valuable time for other buying/events.
But still be ready for nice surprises you see in the dealer room that you may want on the spot.
And definitely don't limit yourself to just buying toys. TFcon has ALOT of fun social events like panels, hangouts, games, voice actor autographs, and constumes.
Be sure to ask for Guber, he's always the life of the party!
