Costco - Costco has a good selection of air purifiers. We've had good luck with the Winix brand and bought one for each room (two in the bedroom). They go on sale for $100 each and can be automated with Google Home, Alexa, etc.
Ikea Nightstand Air Purifier - These air purifiers are built into a nightstand and are a great option for a bedroom. They are also smart but require the Ikea hub to automate.
