Wright is Chicago's premier auction house for twentieth century design. They have recently moved from Fulton to their new location at 1440 West Hubbard Street. Wright is an excellent source for learning about, admiring or purchasing modern furniture and art. Their auction catalogs alone are an amazing reference.
March and April Auctions: Modern + Contemporary Design, Books on Modernism, Branded Luxury.
Online Purchasing: A section of Wright's website, entitled "Wright Now" features select pieces of 20th century design for immediate purchase.