I managed to find the other flavors here, but it took a bit of looking. Nothing at Sheetz (a gas station and fast food place that's big in Ohio and Pennsylvania, and is growing eastward, nothing at Circle K, nothing at the drive-thru down the street.
However, it seems as though a couple of Sami Quick Stop (a convenience store chain that I believe is all local) locations near me have them! I forgot how tasty M-80s were.
Khaos is better than I remembered it being, but the flavor is a bit too strong, methinks. I got sick of it half-way through the can.
MIXXD is probably one of the easiest flavors to find near me, oddly enough. The places that don't have the other flavors usually have that in addition to Import, Rehab, Absolute Zero, Lo-Carb, the Java ones, and the original. It kind of figures, really, since that's the only flavor that I've had so far that really rubbed me the wrong way. :s