I'm
almost positive that you can find something cinnamon-y at Bittersweet. I've never had a bad pastry (or meal, for that matter) from there.
You might also try Sweet Mandy B's, Vanille Patisserie (although they are probably the least likely to have something), Bonjour Bakery or Dinkel's.
Bittersweet Pastry Shop
1114 W. Belmont Ave.
Chicago, IL 60657
(773) 929-1100
http://www.bittersweetpastry.com
Sweet Mandy B's
1208 W Webster Ave, Chicago
Tel: (773) 244-1174
Vanille Patisserie
2229 N. Clybourn Ave.
Chicago, IL 60614
(773) 868-4574
http://www.vanillepatisserie.com
Bonjour Bakery
1550 E 55th St
Chicago, IL 60615
(773) 241-5300
Dinkel's Bakery
3329 North Lincoln Avenue
Chicago, IL 60657
(773) 281-7300
http://www.dinkels.com/