i have been thinking about shipping chicks as well. when i talked with the post office they told me that it had to be express which costs more but you still get the same delivery time as priority , go figure lol .... and when i had grown birds shipped it took the full three days , and when you order chicks from hatcheries it takes the 2 to 3 days then as well , i honestly dont know if the post office actual has OVERNIGHT shipping lol .... but they advertise it .....
but hey if you can find anymore out about it let me know , im still looking into all the ins and outs on it as well , also on the shipping across the canadian border i have heard from several people that you dont have any issues as long as you have all of your paperwork there and present , and as far as paperwork i was told npip papers and there were two more i believe