US camera stores? (kenko tubes)

[emogirl]

Hey folks...i will be travelling to the states this coming week for vacation and wanting to take advantage of our dollar....so i need to stop and pickup a few things. Particularly I want to get a set of kenko tubes....so what stores carry them? I will be in Savannah area, and Greenville NC, probably also stopped around the Philadelphia area, but not really going into the city there.
Thanks!