Find out what tires you want and then just make some calls to the local shops. Some places may, on average, be cheaper than others but if you make the call, you may find a shop that has the tires you want on special. Make sure you know what the price includes (just tires, tires & installation, etc.).
Having said that, I just replaced my tires with Michelin Pilot Powers and Imperial Motorcycles had the best price for tires & installation. Brought in my bike, waited about 40 minutes and it was done.