We got bantams from TSC last year for my sons 4-H project. The employee that was in charge of the chickens could not identify what breeds were what on the bantams as they were all mixed together. We bought 7 that looked similar and ended up with 7 OEGB's.
The birds were all healthy and we did not lose any. I've been told they are not show quality due to being larger than standard.
If you have certain bantam breeds you are interested in look at the "What Breed Or Gender is This?" forum on this site and search on TSC. There have been many people post pictures of chicks they bought at TSC asking for help ID'ing them. Also, if you can find out the hatchery your TSC gets chicks from you can go to their site for help ID'ing them. Ours were from Mt. Healthy and they just list bantam mix.