It has been the policy of Stihl since the beginning to not sell their products online. Instead they stick to strictly selling their tools through dealers in "brick-and-mortar" stores. The reason for this, according to their website, is because "Dealers are required to unpack, prep, and test every unit they sell, and then take the customer through a short training session on the parts and controls of the unit both for their safety and protection as well as for familiarity of the power tool in question."
This business model has served them well for many years, and as many of the die-hard Stihl fans will attest, it is an admirable approach to servicing their customers. So if you have your heart set on a Stihl product you are required to make a trip to the nearest dealer. However, if you're the kind of person who prefers to do their shopping online you need not worry. There ARE other options!
When it comes to power equipment most people are willing to pay extra for top quality products. And when it comes to Stihl there are few that compare; some even following a similar "no-internet" business approach. But if you're looking for a top-quality product that allows for the convenient, money saving online shopping experience, you need look no further than Husqvarna (pronounced husk-var-na if you're unfamiliar with the brand).
The Stihl vs. Husqvarna rivalry is comparable to that of Chevy vs. Ford. Two top-of-the-line products with die-hards on either side. Just punch in Stihl vs. Husqvarna into Google and you will find a whole slew of articles and videos comparing the two.