The first time I bought tires for my VS650 I searched the internet for a couple days (on and off) to find the best prices and free shipping. Got those at BikeBandit
the 2nd time I just went to BikeBandit.
You may have to search on sizes or manufacturer. If you just look at tires they think are 'for' your bike, they may have what you want but the search wont find it. For example, I wanted the original OEM Bridgestone tires. The search for my bike would show the rear tire but not the front, but they do sell the OEM front tire.
In fairness, knowing every tire that will fit every motorcycle ever made is a bit overwhelming.