You're right. This can be a problem. Over the years I have accumulated a huge stash and so when I do buy fabric, I'm almost always trying to coordinate it with fabric I already have and may have purchased 20 years ago. If you're putting all the fabric together for a quilt new, it's a bit easier. Most of the sites have a way to take the fabric to a "Worktable" or you can buy from the same line by the same designer with a good expectation that it will all go together. Otherwise, I usually opt for a fabric that will "go with" rather than try to find a fabric that will "match". Getting exactly the same pink or red or blue or green is almost impossible. Still, I love the convenience and ease, especially since, like you, I don't have a quilt shop or fabric shop of any kind within 90 miles.