Just to update folks on what I've found so far:
In addition to the 3 "for-fee" curriculum providers listed on code.org:
There's a for-fee curriculum for APCSA from APlus. They will send you a trial login, and the pricing doesn't seem too bad.
UMass has a for-fee curriculum called iJava. They offer a free trial for teachers, and it looks like it costs $10 per student.
EdX has a free curriculum online for APCSA (at least the first part of APCSA) from Purdue University. I've been going through it. It is solid, but I am concerned about its availability for students (and me) next year. It seems to come online and go offline depending on EdX's schedule.
A couple of folks have used the APCSA textbook from Pearson. I'm not a fan of textbooks, I greatly prefer an online curriculum, but good to know it's there.
There are lots of bits and pieces on the AP CSA website, here http://apcentral.collegeboard.com/apc/public/courses/teachers_corner/228631.html.
I'll post more as I find it. Thanks to everyone for their feedback and suggestions. JR