BRING LOTS OF MONEY! And then bring a few bucks more! Buy everything in sight!!
Lol, just kidding :P Definitely give yourself a budget and try hard to stick to it! Make sure you inspect the plants before buying, especially if it's from a member's sale table! Look through all the plants you can, often times there are some really special things tucked in amongst the common showy phals, catts, and the ever popular oncidiums!