What are the best rates for airport shuttle from Gurnee, Il to Milwaukee airport?
The only shuttle service listed on the MKE website is Go Riteway mitchellairport.com/ground-transportation/
When I'm looking for ground transportation in other cities I usually go to the airport website for info. You might also check around Gurnee to see if any Illinois shuttle services will bring you up here.
The other option is if you can get to Kenosha there is Coach bus service from the Brat Stop to MKE.