Not sure if you want to admit how far out in the boonies of WA you might be... So look on this page an see if there is a
shop near you.
VaporSearchUSA
The prices are higher than mail order cause their kids gotta eat too, but not nearly as crazy as the mall or 7-11 disposables. Don't know about Wallyworld since I have never set foot in one.
There are shops in Spokane, Bellingham, Tacoma and tri cities.
If your in Republic, Mattewa or Omak then you should be used to driving long distances to visit civilization. :0