They'll be ALL over ebay as well. Tons of sellers. Comic shop's websites. On ebay you can get most of them for $9-12 with free shipping. My comic book store charges $10.50. Hot Topic charges $12.50, but they do sales all of the time where you can pay less. Barnes and Noble charges $10-ish and you can get free shipping if you spend over $50.
After they're out, you most likely find deals on ebay for the full set for $55-$65 with free shipping.
haha. Can you tell I've bought a ton of pops?