@barrywayne Cheap and good seem to me to be mutually exclusive for mesh nebulizers.
For many years, I relied on the De Vilbiss Traveler portable compressor with rechargeable battery pack. Before that it was the Pari Trek S. Both fit in a small case in backpack or carry on and have been reliable.

Last year, with 2 of us now using a neb, and planning several long trips, we gulped hard and invested in the Pari eFlow Rapid. It is a hybrid - tiny compressor drives a mesh head (we each have one) that connects with a slim cord. It is FAST, quiet, pricy, but proving to be durable. Saline neb takes about 3 min, as does levalbuterol when needed.

It fits in a tiny bag, runs a long time on one charge, we clean the heads in detergent & water daily, boil once a week in distilled water.

If you can afford it, it is a great luxury, but Medicare and insurance do not cover it unless you are on a specific medication that requires it. We used HSA $$ to buy. Nebology often has it on sale.