There are definitely variety packs around locally, maybe Buschs on Green rd. if the stores I listed above don't have them. They include Black Diamond, Snow Wheat, Gingersnap, and Mystery Stout. Captain Fantasy hit this week. Bludgeon Yer Eye was last week. You may get lucky and come across Evil Urges.
also, you moron, Plum Market is your best bet for Shorts, they're one of the few places that sell singles. If you'll be downtown near JP or Zingermans, you might as well hit up Main Street Party Store (they tend to rip people off with hyped releases but bottles stick around more often). There's also Wine Castle, which is pretty close to Plum Market as well. If you're looking for Sweet Repute, you might be able to still find it - make sure you ask ask an employee in the beer section - many stores keep the more limited beers in the back.