You might contact TinLizzie and ask what the price for the same set up that AllBrands has would be at the Houston Show. Then you could compare prices and see if you want to wait. They might have extra goodies thrown in, or if it is lower than AllBrands price, you could tell AllBrands that you can get the same set up at the Houston Show cheaper and tell them the price they quoted you and maybe they'll give you that price now. Good luck.
When you contact TinLizzie ask them what's the best possible price they can give you for the set up like AllBrands has but don't mention All brands name. Then ask them if they will have the same set up at the Houston Show and what the price will be then. Try to get the info written down. You then can take that with you to AllBrands to work on a cheaper price there.