From ArborWiki

Morgan & York is the new name of Big Ten Party Store, at 1928 Packard Street, easily findable from the massive (historic!) "Cheese cheese cheese!" arrow sign. Many in Ann Arbor lament the recent change in name and changes in format, but the new owners (named Morgan and York) say the changes have been necessary to their attempt to save the financially-troubled store.

Cheese cheese cheese sign: http://www.flickr.com/photos/mfobrien/61921649/in/pool-44124380973@N01/

Webpage: http://bigtenmarket.com/