Not all products in stores are available outside of unique seasons & holiday trends. Many people think that this only applies to candy & decorations, maybe even clothes possibilities depending on seasonal swings & temperature swings. But, in fact, there are hordes of products that are only available in local stores during select times of the year. I wanted a new propane grill last year & had little selection when I was shopping in January. By the time Summer rolled around in late May of that same year, I had a large selection of grills to choose from. With this in mind, various of these same seasonal items go on clearance towards the end of their respective seasons. In the same way that you can find Halloween candy for 50% off during the days following the holiday, this is also applicable to things appreciate grills, space heaters, & air cleaners. If you want to get the best deal on an air cleaner, try buying a single in November or October when all of the Summer items go on sale to make room for the Fall & Winter time products. Air purifiers aren’t used as often during Fall & Winter time so the stores are naturally making shelf space for things appreciate space heating systems & thick Winter time comforters. I honestly got an air cleaner for 40% off last year because I found the last a single in the store that had been on clearance for a week total when I found it. It’s not a cheap air cleaner by any stretch of the imagination, featuring both UV light & air ionization modes. There is also an occasion to change fan speed regardless of what mode you’re running.