Welcome! I've ordered chicks by mail numerous times, and found Cackle and MurrayMcMurray very good. I'm in Michigan, and have no experience with Privet. If it's within your driving distance, consider that as an option. Order early to get the breeds you are interested in, and have shipping during reasonable weather. Too hot will be as bad as too cold!
With hatchery chicks, they can be vaccinated against Marek's disease, which is good. Don't bother with the coccidiosis 'vaccine' though, it's not really useful, IMO.
If you are new with chickens, consider ordering more varieties! You may find breeds that appeal to you more than anticipated, and others that sounded interesting, and weren't.
Have you looked at Henderson's breed chart? Pay attention to cold/ heat tolerance! If you are in an area with very hot summers, avoid those cute fluffy big birds that do so well here!
Mary