I recently bought a K&N 33-2027 (fits in Capri's stock air box) flat panel air filter for $43 delivered on eBay. The seller is kkrproducts and although he was slow to notice my immediate payment (6 days before I inquired and he didn't see it until I pointed it out) he did come through with 2 day delivery trying to speed things up. He has more of them (4 left). I couldn't find them anywhere else for under $70. Good deal, not so great communication. I'd start sending him eBay messages two days after payment if you don't get a shipped notification. That's the price my SHO panel filter sold for about a decade ago. Overall very happy with the purchase.
https://www.ebay.com/itm/322589934778Well worth it!