Lord Sorill basically has you covered on that one. Otherwise, the only other things I can add are two things.
Of course anything other than lesser and/or Mojave BEL can vary wildly in price. I think Russos have been dropping a bit last year...but I haven't checked recently.
And the other is if you haven't seen anything else that caught your eye beforehand or the prices were still just a bit too high, don't be afraid to stay for the last hour and recheck. I try not to be 'that guy' but if one is just a little bit higher than my budget, it's worth it to ask at the end of the show if the breeder would do something lower on the price. Sometimes just taking one less snake home is a a motivator for discounts. Some tables will specifically mark down animals the last hour or two of the show for that reason.
Heck. I even had one breeder just tell me "100$off!" For the last girl I purchased since it was 20 minutes to door close and he recognized me looking at the same snake earlier in the day.