Aside from variants (red battle droid, blue saber Palpatine, Anakin w/Dooku saber), which Canada never gets anyway, the only figures hard to find are Blue Guards (not even a report on them being found up here), and the AT-TE Gunner wave. The Gunner himself I've seen once at retail, and the others I saw more than one, but after they went (within a day), I never saw more.
The SA Clone wave is just hitting now, and the Wal-Mart near me had tons of all four figures in the wave.
Vader sold out quick, and while I've seen him here and there, he seems to be the best seller out of all of them.
Barada