Hi. I don't know where you are in Chicago, but we're a bit south of Chicago (about 30-45 mins from Chicago... depending on where you are in Chicago). We're in Munster (46321).
We sell wood shelves, custom sized to fit the cage, and we sell chew toys and food (Mazuri) as well. We sell just about everything except food bowls. As for the size of the shelves, I want to say a 35" fits long ways and it's 23"(?) for the sides, but I would have to double check. I just made shelves for a FN the other day. Here's the link to the page on my website where it shows the various things we sell -
http://www.nwichinchillas.com/suppliesforsale.htm The shelves are a bit of the ways down, and the chew toys are below that.
As for stores that sell chew toys and food.... you can find Oxbow and Mazuri at Petsmart, but you will end up paying an arm and a leg for them. Often it's cheaper to get them elsewhere... They do have some chew toys that are safe at the pet stores... but like anything, not everything is safe... some stuff is made out of unknown types of wood, so that type of stuff we don't give..... well, we mostly make the toys for our chins, but some stuff we do buy. Here's a link to the stuff that we consider safe from the pet stores -
Let me know if I can help you out! Glad to see someone else from the area! Welcome to the forum!