Major Purchases: Saline Drops

Warm Mist Humidifier

I am researching warm mist humidifiers for my 10 wk old son. He's stuffy every day and I've used saline drops which he tolerates but doesn't really like... plus i hate using an aspirator on him. I really want one that doesn't have a filter or any other part you need to buy replacements for (always hard to find those things when you need them!). So a washable filter- does one exist? I just want my little boy to breathe easier... thanks!