The wife and I went to Atlanta for a grand daughter's high school graduation. While there we went shopping at a TRADER JOE'S. They had tri tips. So I bought what they had and brought them back to S. Florida and froze em. So if you live in the East and have a TRADER JOE'S near you check them out.
If you live in South Florida, send an email to traderjoes.com and urge them to expand into South Florida.