The Chowhound Team split this cooking tangent from its original location on the Los Angeles board:
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I've smoked brisket from both Costco and Smart and Final and found both to be great. You can get a higher quality beef from a butcher (e.g. Handy Market in Burbank) but there's no guarantee that the flavor will be considerably noticeable if you smoke it with a rub (i.e. the subtle flavors of a better quality beef may be lost in the smoke and spice).
It's nice to see someone who is into smoking meats. Get ready for the epic brisket smoke (about 1-1.5 hours per pound of meat)... good times!!