Would it be possible to purchase HEB fully cooked brisket in bulk?

I am trying to budget out a wedding reception. Aside from the reception hall, food being the biggest cost. We will have a Large BBQ pit just outside the main doors of Red Bud Hall (Texas Old Town, Kyle Texas) We would like to buy the HEB fully cooked brisket. According to my estimates I will need approx 1/2 pound of meat per person. We are also doing chicken, Sausage beans etc. So I am looking at about 50 Pounds of meat for 100 people I would think that in order to get some sort of deal on a bulk purchase of this kind say at least 1/2 of the 50 pound being brisket, I would need to contact the supplier for some sort of discount. Were should I start? Will the store refer me to the supplier? I have my doubts. If just feel if I am getting a discount for purchasing flowers and other items in bulk that meat would be the same. Jeez I feel like such a carnivore.