I've accumulated a bit of a pile of extras (I like to try things), and with some life events I now have time to list these. I come from Wetpixel side too (same name). I've tried to put some ballpark prices up but feel free to shoot me offers. Happy to add pictures with any interest.
Nikon 105 AF-S macro - $350
US lens, great condition, couple marks on the plastic, one minor mark on glass coating is visible but will not affect images in any way
Nikon AF-S 60mm macro - $300
US lens, mint, no noticeable marks on glass or plastic
Backscatter Airlock Vacuum System m16 - $225
pump, valve, bulkhead. Good condition, personally, I don't like mixing this system with the Nauticam which I have on other housing
Saga flat port (Subal Type 4) - $200
mint, unused. Fits Af-s 60 and 105 lenses without extension (w/o any filters), super lightweight and compact, accidentally got a second of these not realizing it was the same
Kraken +13 diopter - $300
mint, don't use this locally (shallow dives = surge) and haven't shot super macro on recent trips
Aquako IV diopter - $200
great condition, also haven't been using this in recent years
Nauticam 105 vr focus gear (N105VR) - $70
Nauticam Macro Port 87 (na-18702) - $325
glass has slight water marks, I can look into replacing but doesn't affect images
Nauticam Macro Port 60 (na-18701) - $350
Nauticam N120 Extension ring 30 (21130) - $275
Subal FP68 + Saga Dual Flip - $400
prefer not to split but will consider
Subal 45 viewfinder - $250
ok condition, this has a split in the glass internally which shows up more from off angles
Subal 180 viewfinder - $350
great condition, clear and clean glass, no rubber eyepiece though
Aquatica 8" dome - $250
pretty good condition, but a few light scuffs. Shouldn't show UW but may in splits
Aquatica extension (18453, 18457, 18463) - $100/ea
Nauticam D4 housing + Nikon D4S
with a flat port + lens above, can be turn key. camera and housing show signs of use, but 100% functional and still a solid camera
Subal D4 housing, type 4
kind of an impulse buy, but part of a package that I "thought to myself" I would use ... hah..
Subal D500 setup, Navy finish (offers)
Could be turn key, literally almost any config you could want...
Single owner, very well cared for. I picked up a D850 housing so I'm not sure this will see as much use moving forward which feels like a waste