Sue is right about price matching. Most places will do it once you factor in shipping cost. Buying tires through my shop saves you 40-50 in mounting fees too
Which Falken tire are you looking at? IIRC the only 245/60/18 tire they make is the Zeix912 which is available Buy 3 get 1 free through Sears. They are notorious for wearing out quickly on larger vehicles or on vehicles frequently on the highway. However Falken is very good with their warranties in these situations. If you are just selling it, that may not be a huge deal for you, but if you sell to someone you know, make sure they know to only expect about 40k out of them.