There are other alternatives but in my searches none that are inexpensive. I made my own. When I started it was just to give it a try so I wasn't concerned with their looks. I wish I'd paid more attention as they work perfect.
Not long after making these I found a pair of the Soundocity outriggers at a good price here.
Not long after making these I found a pair of the Soundocity outriggers at a good price here.