HEB is selling bulk fresh salsas in some of their stores. Manchaca and Slaughter store has them (in the deli) and I'm pretty sure I saw them at Rundberg, too (grilled chicken station).
I sampled the green and a rojas(?) last night and ended up buying a half print of each (about $1.20/ea). Pretty darn good stuff. I'll be trying the rest of them in the very near future - about 5 different kinds, IIRC. Of course I forgot that I didn't have anything to dip in them, so I ended up putting the verde in their Hill Country Fare "Homestyle" Potato Salad. Even more awesome.
Try 'em out if you have access to them. I don't know if they sell them prepackaged in any stores or not, but that would seem logical for those stores that don't have the bulk display cases.