TSC is where I got my first ones. Where Rural King will get me in trouble is that unlike TSC, RK sells chicks year round.

I definitely need to get better at IDing breeds with a quicker glance. My 2nd group this year, I saw dark color and feathered feet and thought I got 2 cochins. They were both buff brahma bantams. They're beautiful though so I don't regret it. And they're pullets. One other I thought was a cochin is actually a silkie. Same group, so I didn't do so well with guessing lol. I did get my MF d'Uccle with that group though.
It can be tough when you can only see into the bin from above and catch small glimpses of their feet to see if they're feathered. My 3rd group though, the lady actually picked them up to check their feet for me. I got the Self Blue d'Uccle, a blue cochin that unfortunately didn't make it, and a Red Cochin. Those guesses were correct. But what I thought was an OEGB is an EE. I realized that as soon as I got home with him and saw muffs, lol.