When you find a decent balsamic vinegar, you have to remember the brand. There's some excellent cheap brands, and there's some complete crap expensive brands. Something you can look for: if you swirl around the bottle, it should leave some residue as a good balsamic will be semi-viscous (not liquidy like regular vinegar). If you can find balsamic syrup that's my favorite to use- it's pre-reduced and great for desserts or sauces. Normally if you're using balsamic you're looking to add sweetness or fruity flavors. A good affordable brand I've found is Sparrow Lane- usually in the $8-$15 range per bottle.
A great place to find decent balsamic...of all places...is TJ Maxx or Marshalls. They tend to have high-end stuff for around $10 a bottle. Not sure how they do it but it's become one of my favorite places to get kitchen supplies
Hi. I geek out over vinegar.