Depending on where about you live ... I'd choose a hatchery close to you ... Cackle is 35 miles from me, and an easy drive, save the chicks from the postal experience!
Cackle has a 3 female of each breed minimum, but can order 4 or more too, doesn't need to be in increments of three ... They do have a small order charge of $20 for less than 15 chicks ... They also have the Rhode Island Reds in the "Exhibition Type" which are bigger, and more true to the "Standard Of Perfect" (SOP)
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Easter Eggers are similar to the Ameraucna's if you just want a backyard bird, and cheaper ...