Amazon has a Hamilton Beach True Air Allergen-Reducing Air Cleaner for only $29.99. This air purifier cleans the air in large rooms up to 160 square feet! For this price, it would be a deal to find an air purifier that cleans even half that space. It's ultra quiet so you don't have to worry about loud noise. The included filter can be vacuumed so you never need to buy more filters to replace it.