These prices are roughly +/- 20 cents. In Raleigh, NC over the past few weeks, I have found:
Restaurant Depot: $2.50 & $3.00 for whole packers (2 different grades but not sure which).
Costco: $2.95 & $3.50(prime) for whole packers.
Harris Teeter (large grocery chain): $9(maybe $8) for trimmed flats.
I haven’t checked or recall prices at other stores.
Side note: Publix grocery stores are fairly new in this area. They have tri tip for $8.69. Tri tip is not common around here.