I know Waukegan Tire was able to get me set up with new sensors when my the battery died in one of them. You need a OEM tool to do this. They did not have one but they took it to another shop in the area that had one. They are a knowledgeable tire shop that does a ton of aftermarket rims. They are also a full service shop. As far as a cheap mechanic goes anyone with a good shop is going to have charge a certain amount to stay in business in our area. I personally find their prices reasonable. I know this is 45-60 minutes from Schaumburg so you maybe able to find someone closer.
Waukegan Tire 847-336-5305 ask for Javier.