It's a good deal the problem is when you don't buy from a local shop they charge you a lot more... to mount, balance and dispose.
I was talking about the bike tires, but in general the rule does apply
That's why I long ago bought my own bead breaker, a cheap stand, and a static balancer. Paid for themselves many times over doing my own tire changes.
There's pros and cons to each side. Buying online from out of state stores is nice because a lot of times (depending where you buy from) you don't pay shipping or tax, whereas when you buy from a dealer they charge you tax, disposal fee, etc. But in the case of some places they'll charge you much more for mounting tires that are not bought from them than ones that are. I know in the case of my dealer, they charge like $10/wheel for mounting race tires bought from them, whereas otherwise it's like $35/wheel if I remember well.
To me it's all about the brand. Since my dealer sells Bridgestones, if I'm getting Bridgestones I will only buy from them. If I want to try something else, I'll obviously buy elsewhere.
Also, at track days where they have tire service, most places charge 10 or 15/wheel regardless of what tires you're putting on, so that's the cheapest option...you just have to deal with the inconvenience of taking wheels on and off at the track, but that's not really too bad once you've done it a few times.
