Thanks for the advice. I have been looking at Amazon and there are several sellers offering filters at volume, but I also worry about quality. Truth is I am having trouble wrapping my head around any of the pricing for these tiny and very flimsy filters.
If you can buy a Window A/C unit filter for -$4 and a whole house A/C unit filter which is 20 x 20 x .5 inches for less than $10, how can these tiny patches of woven fiber cost this much?
Anybody have success buying larger filters and cutting them down to the right size?