Since learning the Innospire GO has been discontinued (I have 2 left and am dreading their demise), I have only found one that meets my requirements so far (vibrating mesh, not ultrasonic, boilable, etc). Many of them state they are not to be used with hypertonic saline (either 7% or 3%), and most of them can't be boiled.

The only one I have found so far is the Omron NE-U100. It is a few more pieces than the GO (4 boilable parts make up the mouthpiece & mesh cap), but it is boilable each use, which is a huge plus. I have only had it a month so can't speak to longevity, but so far so good. It is a tiny bit slower than the GO, but not much. It says it dispenses from any angle, but I haven't found that to be so, though that is not any different than the GO so I don't have a problem with that. I also find that if I shut it off often during treatment, which I do to huff and get rid of mucous the saline is releasing, then it gets droplets on the mesh cap and I have to sort of shake those off before it wants to start "steaming" again. It has always started again, but I have only had it a month, so will see if that stays true.

I only ordered one to test, but you would definitely want more than one cup/mouthpiece/mesh cap, but you can order all separately and they are considerably less expensive than the GO, which is nice.

Very interested to hear what anyone else has found!