I had to do this today, and I thank you so much for your post. I could not do the scissors method, even if it is quick, and I thought that was my only option. This was neat, fast, and humane because the chick fell asleep and died within the minute. Thank you.
We we lived in the Philippines, we noticed that native chicks free ranged from birth. (Admittedly, they were scrawny, but they tasted amazing.) Therefore, we've been allowing our chicks to roam in a "play pen" since they were a week old and now forage throughout the yard at two weeks. I think...
I agree that MM is very good. If you want to show, or if your USPS is problematic, then do not do ANY mail order hatchery. Otherwise, MM is terrific: prompt, happy, and healthy chicks (see below). Also, their website is very informative for ordering.