If you read their chicken section, they are very clear that availability depends completely on how many hens they have laying, how many chicks they hatch out, and how many orders are placed for those breeds. Some of their rare birds may not be available for long periods of time. 2 years ago they had raccoons get into their pens, and totally mess up their orders for the entire season.
From their catalog -
Please remember we are not a 24-hour fast food place where you can order and expect service immediately. We are doing this as a hobby business service and we work as fast and efficiently as the time allows. We cannot guarantee specific hatch dates, as we cannot guarantee the hatch rate or laying rate of each of the many breeds that we have. We will get to each and every person that places an order - in the order the date that we receive that order in the mail. If you are impatient and absolutely have to have something by a certain date, please do us and yourself a favor and order from somewhere else. We realize the above statement seems cold and harsh, but we are simply not able to deal with creating chicks at the spur of the moment. We are at the mercy of the birds and there isn't anything that we can do to change that. We reserve the right to refuse service to anyone for any reason.
Our office phone is available 24 hours a day. Linda will be by the phone most Mondays and Thursdays from 2:00 to 4:00 p.m. Central Time. We have a voice mail service now. We ask that you leave your name, number and best time to return your call. We will try to get back to you as soon as possible, although, it may not be the same day. We have lots to do here and sometimes it is impossible to deal with all the phone calls we receive. We do not make or accept phone calls on Sunday. Spring and Fall are the busiest times as so much has to be done that it may be the first rainy day before we get time to return a call.