Try
Tienda Tzintzuntzan, the gift shop at the National Museum of Mexican Arts (W. 19th St between Paulina and Damen), and
Artesanias D'Mexico, on W. 18th next door to Mundial Cocina Mestiza.
Here is a link to a write up of the couple who run Artesanias D'Mexico:
http://abclocal.go.com/wls/story?sectio ... id=4578560
Definitely call them before going, because the store is closed when they go to Mexico to buy more items. But I think they are in Chicago right now because last week there was a truck unloading big chimneas in front of the store.
Artesanias D'Mexico
1644 W 18th St
Chicago, IL 60608
(312) 563-9779
Tienda Tzintzuntzan
National Museum of Mexican Arts
1852 W. 19th Street
Chicago , IL 60608
312-738-1503
T-Sun 10-5
http://www.mfacmstore.com