This is one of the top-rated air purification systems I found while doing some research online. BBB currently has a sale on it, priced at $179 (from $249). If you can get your hands on a 20% of BBB coupon, you pick this up for $144.
https://www.bedbathandb
The unit is also on sale for $179 at Amazon: https://www.amazon.com/Blueair-Cl…B002A9JHB2