Primacoustic's VoxGuard VU is.
The VoxGuard VU takes this concept one step further though, and adds a 3 inch by 7 inch Plexiglass window so that the vocalist can see the rest of the band or receive cues from the producer (among other things).
The unit fits on to a common microphone stand and an extender clamp allows you to fit the microphone holder. It's also adjustable so that you can move the mic closer or further from the vocalist.
It's always better to have a good sounding quiet iso room to record in, but when that's not available, try Primeacoustic's VoxGuard VU instead. It retails for only $99. Here's what it looks like.