you will find the best prices for tires online..
the only thing is that I have heard is there are not a lot of places like to mount tires that were not bought from them.. they kinda give you a hard time about it..

but if you know a good place than online is the best way to do it IMO

 

Things are a bit different here (with bikes that is - cars are a different story). I haven't had to buy tires but when I do, there is a shop about an hour away that has the best prices. I know ppl that buy them from them and then go to another shop and have them put on. This other shop has awesome rates and do excellent work (so I have heard anyways).