9 times out of 10 you can get cycle tires online shipped to your house much cheaper than any local dealer can. However, doesn't hurt to ask if the local dealer can price match the online price you found on same tire especially since if you tell them you will let them install the tires and pay for labor. Some dealers will price match, most will not but doesn't hurt to ask.
I went online and priced a large order of kuryakyn stuff... Iso grips, footpegs, highway pegs, powerpoint cig lighter, Memphis Shades shield, brackets and lowers and some other things that I cant remember now... TIMES 2 for outfitting 2 bikes the same way.
I went to the local MC Dealer (Cycles128) with all my homework with the best pricing I could find with part#s etc. I simply told them that if they matched it all or better... I would order from them and they would retain me as a customer for other things also since I was local. I gave them the option and said it really didn't matter to me cuz I could get it all shipped to me direct for free.
The guy wanted the biz and spent about an hour rounding it all up in his books and online and took the order.
They got my local biz, and I stimulated my local economy...
Point is... do some research and see if you can get the local guy to bite.