Good used condition Ikelite 8" dome port with extension ring (I believe the one for lenses up to 3.5"), extra o-ring, neoprene cover, & zoom gear. I currently can't find the locking mechanism that goes with this, but will keep looking for it. If I don't find it, the kit is ~$15 from Backscatter. Dome is in good condition with a few very minor scrapes that don't affect/show up in your pictures. The dome shade has a couple of love scrapes/scratches, but they're only cosmetic. Dome was used in a mixture of salt & fresh water dives & was soaked & cleaned after each use. I tend to be super gentle & baby my photography & dive gear, so you'll be getting a dome (plus extension ring & zoom gear) in pretty good used condition for well less than half of what it costs new.
$250 plus shipping CONUS. Paypal F&F preferred or add $8 if using G&S.
