My last case of briskets was prime grade, had two in the case that were over 17 lbs. each and ran me $2.44 per lb. Of course, I was fortunate enough to know a business that would let me order under their Sysco account but they were really nice briskets.
You might want to get in touch with Vande Rose meats out of Iowa and see if they have any distributors in your area. They are not real large briskets but they have excellent flavor. And just so you know, this is not the brand of my last case.