I'm cheap, I went to walmart and bought a large furnace filter for about $10, cut it down and hot glued cardboard on all 4 sides so it matched the original cabin air filter and slid it in. Been about 6 months now, probably due for a change. I still have enough furnace filter to make 3 more cabin air filters lol!
Down side is I broke the clip on the cabin air filter door that clips to the top, I glued it back together but I know it will fall apart when I remove the door so I'll need to try and find the part number to replace it.