80's Fourtrax air filters, Where?

Anyone know where to get new air filters/cleaners for an 85 and 86 Fourtrax 350 4x4 ??

I searched on-line and found a K&N for $50.97.
Anyone know of any cheaper ones?? OEM or aftermarket???

I'd prefer to call an order them rather than order on-line but either phone numbers or link(s) would be great.
I'm in PA if it matters.....

Thanks for any help