You can make your own with a furnace filter and some screen mesh. When I had my S2000, I made my own replacement for the OEM one that way in about 20 minutes.
OEM:
DIY:
Parts
Cabin Air Filter Parts:
Buy a filter for a ‘97-’01 CR-V / ‘00-’06 Insight Cabin Air Filter and some foam weatherstripping tape (also found at O’Reillys.
- ‘97-’01 CR-V / ‘00-’06 Insight / ‘96-’00 EDM Civic Cabin Air Filter Frame
— Honda Part No.: 80292-ST3-E01 – List: $13.74