I have only been to the Nemo one at DLR and what I know is:
Hotels:
Paradise Pier has some in its shop but very little so they go fast! (I was there at 7:30 and they were sold out! So I guess you have to stay there to get it when the store opens)
Disney Grand Californian- HAS NONE (so frustrated but they don't get any)
DLR Hotel has the same situation at Paradise Pier as well
Next is DTD:
I lined up at the DTD store and there was already a 20ish people line for PODM Nemo (which I don't think was very popular) and the line STILL took 1 hr because people take a loooooong time selecting scenes. So if you DO choose DTD and you are not the 1st ish one, its tough to head over to the other places I think for good pick. (I got there at 8 and then got to see the pins at 9 and I think I was 20th in line)
WOD opens later so you should be fine there.
In the parks:
the stores that definitely have them are Little Green Men, Fronteirland Pin store (I heard that this store is really nice about this release). Unfortunately, LGM only lets each person see 4 scenes while the Frontierland lets you see as many as you want. They even organize it by scene
. Also, the ToonTown stores sells it and if it opens later, you "could" get best pick there too.
Disney California Adventure has them at the Fly n' Buy too.
But if you are just one person, its hard to hit all of these places I think if you want good pick. (but I have only been to one once so maybe other DPF members have better/ more accurate advice)
That is all I know so good luck! I would love to see your scenes when you get them
Hope that helped.