Balsamic Vinegar can range in price depending on how pure it is and how long it has been aged.

The longer it's aged, the sweeter and thicker it gets—and the more expensive too.
Feel free to buy several different types of balsamic vinegar for different uses.

Less expensive kinds of vinegar are best for marinades and salad dressings where there are lots of other ingredients.

The flavor may not be best on its own but it will work very nicely when combined with oil and seasonings.
The really expensive types of balsamic vinegar that are aged for years in oak are ideal to drizzle over cheese and greens.

They can also be used as a garnish or finishing touch to many recipes. It would be a waste to use such a special vinegar in a salad dressing.
White balsamic vinegar is also available.

It's perfect for a light colored salad dressing.