Do you mean TSA-approved locks or locks that TSA can open? The TSA regs say that "only the passenger should retain the key or combination...". (https://www.tsa.gov/travel/transporting-firearms-and-ammunition)
Agree with much of this - especially making a plan that you can stick to. One thing that's surprised me is that spending a little more in one area can save you a lot in another. We buy higher quality groceries, and as a result spend much less in going out to eat since we're happy to eat at home.
Another benefit of tacos- you can freeze the meet ahead of time and it helps keep your cooler cold. Then pull it out in the morning and cook it that night.