Welcome to the site, and to organic gardening!
Sometimes getting started in organic gardening can seem expensive because of the various products needed to treat various pests or to build up the soil, but in the long run it is much more cost effective. Also keep in mind that how you water is very important. Water deeply less frequently and your lawn will establish deeper roots and withstand the hot weather much better.
Not to turn this political, but I always thought those organic types were nothing more than communist liberals.
Then I started doing my research on pesticides and applying common sense. Poison kills plants, what does it do to humans as we all know that washing under the faucet is not going to get rid of everything.
Now, I avoid any non-organic foods. I called into Howard's show a few weeks back just to let him know how totally awesome and right he is about organic solutions that actually work, versus the chemical business that makes things artificial, and in some cases dangerous to humans and pets.
I'm off my soapbox now, and hopefully I won't get banned for my rant.