I did a quick search after posting and it seems that Mt. Healthy in Ohio had a salmonella outbreak last year, and they carry all the breeds I typically saw in TSC. I have never heard the stores say that they know what kinds of chicks they are getting.....they just arrive and they get what they get.Townline might not be listing chicks that go to stores...only those available to ship or pick up.
Best bet is to call the TSC you're interested in buying from and ask where they are getting their chicks....
.....and maybe what they are getting.
Tho I tried asking in the store last year and 'corporate' seems to be in control and the (very frustrated) employees at the stores are as much in the dark as we are.