if you're looking for that yoplait in the little crock, look no further than formaggio kitchen in cambridge (maybe south end, too). call before you go because they tend to sell out fast. they normally stock the vanilla flavor and occasionally lemon. seriouspig, i saw your post from november but figured you wouldn't be looking all the way down the list for a response -- so here it is! it's a good thing you're in the boston area.
the yogurt is $2.95 (ouch!) but cheaper than a round-trip fare to france . . .