Ok so let me know if this sounds fair. 1 7lb brisket flat, 4 racks of st. Lois ribs, 2 6lbs butts, and 100 wings I was thinking $400.00
Hard to say without knowing the price of the meat. And are the ribs pre-trimmed? I mean, 4 racks of ribs at $3.29/lb vs. $1.69/lb is a big difference. If they are untrimmed full spares, that could be the difference between $72 spent on ribs or $37. And if they are untrimmed and won't be using the tips, you're paying for waste, or at the very least, meat that isn't being used at the event.
If I'm looking at my prices locally and your menu, my costs would work out to be about like this (paying retail, not wholesale):
1 brisket = $25
4 racks = $44
2 butts = $21
100 wings (approximating around 12 pounds) = $22
So, that would be $112, before tax, cost. Times 3 and it's around $340. $400 would be doable as long as it wasn't really far away and I'd end up blowing $80 on gas to get there and back.
So as long as you aren't paying outrageous prices for your meat, you're probably in the ballpark. But if all of your meat is at the high end, like $5/lb brisket, $3 ribs, $2.50 butts, etc. it will add up quickly and you may find your quote a little short.