I bought Purolator cabin air filters for my '00 Accord at either AutoZone or Advance, don't recall which, so I would bet you can get one (two?) for your Ody at one of those places too. You can for sure get the engine air filter from someone besides the dealer. I have a Purolator filter for my '01 Ody in the garage as we speak. It would probably work better if I installed it...
Wiper blades you can get pretty much anywhere, as long as you get the right length. The two front wipers on the Ody are different lengths, and I think the rear wiper is yet a third length, IIRC.
I don't know whether you've changed the cabin air filters before. I haven't done it with the Ody, but it was quite a job with the Accord.
Paul