I would say that a vast majority of purchases are made online these days. There was a time not too long ago that only certain products were bought and for everything else you shopped locally or made a trip to a close metro area. I do my fair share of online shopping, it’s just too convenient. Buying large items such as vehicle tires was not something I had ever expected to myself to do but I have now done it several times. One of the sources I have used is TireRack. Here is a quick screencast video of how I use the site:
I hope this helps introduce you to the site. If you have any questions please comment below and I will be happy to answer.