I live in the western suburbs of Chicago and I'm planning on aerating and overseeding in the fall. Can anyone who lives out in this area recommend a reputable company which sells quality weed free or near weed free grass seed. Also I would like the best deal I could get but if it means sacrificing quality, I'll go with the more expensive. If there's a company which I can order online, please advise. When is the optimal time to begin this, which month? Thanks to all.