Dennis Kirk is another internet site that has among the best prices. I don't know if they do the reward dollars, but DK seems to have really good pricing on tires. Jake Wilson is in the same ballpark.
I try to buy parts from my local dealership. But when I went in with my most recent tire needs, they said they couldn't touch the pricing that was offered by Dennis Kirk, Motorcycle Superstore, or Jake Wilson.
When I first started riding I recall hearing Dennis Kirk had good prices, but that was on a "we'll beat anybody's price by a dollar" plan. Buyer does the leg work, provides evidence of cheaper price and they'll beat it. But their catalog/web prices were outrageously high, way above others standard price. I think its a bad business model, you're basically using highly inflated prices for normal sales, but will give a deal if people can find a better price. I'd rather just find the better price and buy from that company. Not sure if that has changed, but I've pretty much avoided DK since then.
As for my local dealer, I've supported them some and try not to just use them as a place to try on gear. I've bought a helmet, and some other gear. But Brick nailed it on tires, they cannot even come close and I buy 1-2 sets a year. I also get them mounted at the dealer, if there was incentive (free or discounted mounting) to buy from them I'd consider it.