I have two 500 Hz filters, but not much of a need for both. They are the #217 9Mhz filter and the #285 6Mhz filter. Looking to trade one or the other for either a #219 or #282 250Hz filter. Prefer straight-up trade. But will sell either 500Hz filter for $70/shipped. If any interest, please contact me directly at rmpjr at forcomm.net 73 Rob KA3S