you'll have to dig it out yourself because i have never heard of bone marrow for sale. that bizarre foods guy eats it all the time and says it's yummy.
personally, i have never liked the taste of marrow, brains, or horse manure.
i guess i'm not cooking it right.
You can buy it at Publix. They'll have veal for Osso Bucco. Or, sometimes, you can find just the sections of bone. I cook it with a light tomato sauce. It's real creamy, almost buttery, if cooked right.