Hi, I have three never used filters that are excess to my needs for the K3 & K3s: One: KFL3A-6K 6kHz AM/ESSB, 8-pole filter. Two: KFL3A-1.0K 1 kHz, 8-pole filters. $125 each, shipped to the lower 48. Please contact me off list if you're interested. 73, Gary KA1J