Hopefully you'll find your kitten, sneaky little devils are lovable and crazy.
You might also want join the Nextdoor -- its like facebook, but specifically for your neignborhood and post there.
Mclean County Animal Control has this page up for lost animals... its not entirely helpful -- http://www.mcleancountyil.gov/index.aspx?NID=953
You may also want to contact the local shelters - the Mclean County Humane Society, Wishbone, and CISAR.
Oh, you may want to x-post to /r/blono as well.
Keep us posted and Good luck.
We used the Ikea one on a high top table at home and it seemed to work fine, but eventually switched to a seat booster since we had a bench chair: https://smile.amazon.com/gp/product/B019FZ0R76
Another option for an attached chair:https://smile.amazon.com/gp/product/B0019AC8GE
I live in NC now, in an apartment next to a highly wooded area. Like way more trees than you ever see in Central Illinois, so I would get a ton of spiders and other critters trying to come in.
I started use Ortho Home Defense and its been a life saver. You use just spray along the inside and outside of your doors and windows, and it keeps spiders out