The Stock Shop is a feed store in Glendale. That's where I buy all my feed & have purchased most of my chicks. They don't normally have older chicks, but like Laree said, these chicks got too old for the baby pen and they don't have another place to put the larger chicks. They get day olds in almost every week and have some cages for roosters & hens that people bring for them to rehome (those chickens are usually sold pretty fast).
Carol - your incubator looks great! Is it made out of a styrofoam igloo? Once you get it stabilized, just know that it will take awhile to get back to the right temperature once you add your eggs - the humidity will go up quite a bit too, but shouldn't stay up. My biggest tip - start the eggs in the daytime. I started mine at 8 p.m. and was up till 2 a.m. making sure the temps were stabilized before I went to bed (I tweeked the dimmer just a little about 4 hours after the eggs were added and needed to make sure the temps had stopped climbing before going to bed.)
I think my thermometers have finally caught up to each other (I think some just take a LOT longer to register changes). Last night & this morning all 4 were within 1/2 degree of each other - this morning they were the same. When I took the fan out to turn it around, it took me a while to find the right temp again with the dimmer - then with taking the lid off to turn eggs, I think the slow thermometers just couldn't keep up with the temperature changes. Hopefully, they will keep reading closer together.