I would cook about 65# of butt and 68# of brisket (raw). This should yield 12 oz. per person. I normally use this as my protien avarage, but we are feeding Texans! As far as pricing, these are both long cook time items, will you cook on site or off site and deliver? $50.00 in wood and charcoal, $50.00 in spices and the remainder is up to you. Cooking these protiens, 8-9 butts and 6-7 briskets is probably worth $ 600-700 if you purchase the meat.
Hope that this helps.
Ring of Fire Cookers & Catering Co-Owner, 2 Stick Burners, 2 Weber Perfrs and 2 much Q stuff!!