I know this thread is old, but it comes up on a specific google search that would have helped me out previously.
Calling around recently to find cartridges, I discovered that a head shop downtown on main street has KR808 kits, carts and batts, and a head shop on North main, and a
tobacco outlet on south main are both looking into carrying them as well (A
tobacco outlet down town was actually quite rude - "we only deal in REAL
tobacco products"). I am not mentioning specific names because I have no affiliation with any of these places, and don't wish to be accused of such. Just putting the information out there that they are available locally if you look around a bit.