I do nasal irrigation everyday.
I bought a device called the Grossan Hydropulse from an allergy site. My insurance covered the $99 cost.
If you want to go a cheaper route, you could use a neti pot.
I don't use salt for my rinse. For awhile I was buying the Breathease powder that came with my machine, but that is kind of expensive. Now I am using a homemade xylitol/distilled water mix.