Established in 1960 by Grace L. Bigby and Demaris E. Cash. The Treasure Mart Ann Arbor's Exclusive Resale Shop. Everything is sold on consignment. Sellers pay a nominal membership fee to dispose of their merchandise incognito. Buyers delight in browsing among these "treasures."529 Detroit St. Ann Arbor, Michigan. Estate Sales Our Specialty. Mon. Thru Sat. 9 - 5:30 Mon. & Fri. eves. til 9.