Crazy fluctuations in price, but these are good. :-\
I really like these. They work well. When I ordered them, they were priced at $39 and change. Now the prices have risen beyond $100 for the same product. I'm disappointed in that.  I probably won't purchase them again.  They do seem to work well in a house with two dogs and forced air heating, I have noticed a difference.
Rating: 4 stars