Welcome to the forum. I highly doubt you find anyone in Central IL that grows and sells hops, or grow/malts/sells barley. For the hops, I would recommend checking out Farmhousebrewingsupply.com, hopsdirect.com, freshhops.com, etc. You can get bulk or semi bulk, which will save lots of money. For the barley, I would try to find a bulk grain in one of the cities close to you. I know Chicago does them fairly regularly, St Louis probably does also, not sure about Springfield. I usually get my 50lb bags of 2 row for about $26-28 in group buys. Here is a good place to look for or inquire about a group buy:
http://www.homebrewtalk.com/f174/