I have had good success with Welp, Ideal, and Meyer. I don't personally like Murray McMurry, because they ship on Thursday or Friday. I live close enough (Nebraska) the birds are shipped ground and I get them after they have been in the Postal system over the weekend.
I like Welp because the shipping is included in the price of the chick so there is no surprise at checkout, Welp is associated with Privett Hatchery and birds from Privett are shipped by air. Welp also has a great selection and I have gotten real good birds from them.
I have ordered a lot of birds from Ideal and have good success. I order a lot of rare and endangered birds and they have a great selection. They must have had problems, because most of the rare and endangered are not available this year.
I really like Myer, but their shipping charges seem real high for shipping to Nebraska from Ohio.
My experiences with Cackle have been mixed. I ordered some birds from them two years ago and everything went real well. Last year I ordered and my experience wasn't good. The birds came with a lot of shipping shock and didn't recover. When I called they put me through 69 questions like they didn't believe my claims. This year I haven't ordered from them, but considered it. Their shipping charges seem to have gone way up.