There's a small place called Live Oak Market on Manchaca just one block south of Ben White that has it in a fountain, in glass and plastic bottles as well as cans. A six-pack of the 8 oz. set be back about $7. They also have Big Red, a cola, root beer, and something else made with pure cane sugar. No NuGrape though. The place used to be a 7-11 but a local guy opened up a small store there. They have a nice selection of craft beers, a very small deli, and the typical convenience store items.