Got my Pollen filter here:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
Very happy with the filter. Since it doesn't have a cover and is very open to the elements and is in a very precarious location I took out one of my home hvac merv rated filter and covered the P Filter with it and snuck it in place. Don't ask why, just thought it would be better.
BTW, I do order form Pelican and Sunset. Even my local dealer. Go figure!