Keep going back to their website between now and May 15. Sometimes people cancel their orders, or the birds lay more eggs than expected, and a few more become available. If any Dorkings pop up for May 15, just put in a minimum order of 3 birds for May 15 as soon as you see them online. You can call customer service later to have the orders combined (to save on shipping) and delete any extra birds you had to order that you don't want/need.
I had to do this several times with my order to get the Black Copper Marans I wanted, as well as the Olive Eggers. Staff at Meyers were super friendly and were the ones that suggested I do this in the first place, so they are pretty used to it.
Good luck!
If you see the ones you want are available and chat is active, just chat with them and ask them to add the new ones to your existing order. You just need your order number and they can do it as you chat. I've done this a couple of times and I can see the order update online get a confirmation email of the change before I even end the chat. Easy-peasy
Thank you so much! I would’ve never thought of that.