I just purchased a pari proneb ultra II from ihealthdepot.com for about $50. In the past I've purchased from american allergy (filters and neb cups) -- they have the same machine for about $60. I ordered a devilbiss from comfort 1st via shop.com for under $120. Our first pari we got from the hospital (apria) and our insurance was billed $360+ for a machine I saw online for $70-100