Hello to the list. I have the following filters for sale: 2 #288 1.8 kHz @ 6.3; $70 each shipped. 1 #285 500 Hz @ 6.3; $70 shipped. 1 #221 250 Hz @ 9 mHz (passband centered @ 500 Hz); $85 shipped. 1 #754 INRAD 2.8 kHz @ 9 mHz; $80 shipped. Will sell all five for $300 shipped. USPO MO or PayPal +3% Thanks, Markus. Please contact me offlist k5wtx at cox.net