Donna, as you know, I have Meniere's too, and concerts can be miserable!
There are also lots of ear protection choices in the Home and Garden Center at Amazon.com
http://www.amazon.com/s/ref=nb_ss_hg?url=search-alias%3Dgarden&field-keywords=ear+protection+&x=14&y=20
Edited to add: My link didn't work very well, but if you click on the link you will be taken to a partial list on Amazon. To see more choices, go to the top of the page where it says "Search," scroll to Home and Garden, and then hit the "Go" button, and you will get more choices.
Some of these are pretty reasonably priced. Since you need them pretty quickly, I have a tip if you plan on ordering from Amazon. They are offering a free trial of Amazon Prime which offers you two day shipping. It is pretty pricey if you decide to keep it (the Amazon Prime Plan), but if you choose not to and cancel within the first month, you don't owe anything.
I used the free trial last month and didn't have any trouble canceling it after I decided not to keep it.
Have fun at the concert!
Hugs - Austen