I have an IQAir filter. Not at all cheap, but are state of the art, Swiss room size, hospital grade air filters. The outer filter has to be replaced once a year, and the primary I think once every three or four.

However, I would highly recommend allergy drops. These are like allergy shots, but you don't have to go in every day(for a while)/then every week. Instead, they are sublingual (drops under your tongue). They have not solved all my problems, but have solved a *lot*. This is a commitment for at least three years, but helps within a few months, and drops only have to be mixed/picked up once every three months, and are custom mixed for your allergies.

IQAir filter is $1,000, then $100 annually and $400 every four years about.

Allergy drops are about $400/three months, plus initial doc appointments and testing, but may be covered by insurance. If not, at least allergy shots usually are.

The best quality cheap-o solution: OTC Flonase, and a good quality vacuum.