This order fom has a deadline of Oct 1, but maybe you can sneak in or find the equivalent order form for your state's auxiliary (this one's California).

Or make your own -- there's a drawing on this page, a photo on this page, and instructions for a similar flower (CA state poppy) here. Add a strip of white paper printed with the "In Memoriam" message.

On the other hand, buying them from the various AmLegionAux may support the spirit/intent of the display more than making them yourself.