I have the following filters for sale as a package only. $200 shipped within the US. All in good working order. Typically used for roofing filters in the Orion, but can also be used in the Omni-V, VI and VI Plus. Contact direct. Model #217 500Hz CW Model #218 1800 Hz SSB Model #219 250 Hz CW Dwayne Kincaid WD8OYG