Lumicon 2" Deep Sky Filter with 90+ % transmission numbers. Only $75 (just reduced from $85)shipped in CONUS (or make offer). But there's a catch and hence the price. I fumbled a heavy 2" eyepiece and there's a small scratch on the coating on 1 side that I've captured in the attached image. Also transmission numbers can be found in the attached image.
Consider interesting trades. For example,Meade Series 4000 eyepieces (Japan) or TeleVue.
Thanks for looking.