Any nebulizer works with the 7% saline. If you are mainly a homebody, the Pari Vios is a bit large, but they last forever. Both my primary insurance and Medicare Part B cover this very basic model. If you need a more portable one, several here may be able to chime in with recommendations, but my experience is the Pari is more durable and dispenses faster.

7% saline is available on line, but if you have insurance and/or Medicare it is significantly cheaper with a prescription - in my case, Rx copay is $10-14 for 60 vials, online it is around $40-50 for 25 - 60 vials. (I see Nebology.com currently has it on sale for $27 for 60) You will see lower-priced saline, but be sure you are ordering 7%, not .9% (the standard dose) or 3% (not as effective.) When I was unable to convince my first pulmo to prescribe 7%, I bought online, but followed my usual practice for medical items - not from eBay or 3rd party sellers - only from a medical supply place or official medical supply seller through Amazon.
Sue