Might be a prime rib. Local market gives out a calendar every year with a discount coupon every month. This month's is for a standing rib roast, a whopping $10 off.
Not sure that's going to be enough to make it affordable this year, beef prices being what they are.
Might just have to see what nice cuts are remaining from the 1/4 steer we got this spring.
Or buy a ham. I like ham at Christmas. Even if I am celebrating the birth of a Jewish kid with a hunk of pork.