Ken have you checked North East Scuba Supply in Norristown? They have an extensive used equipment area and a partial list is on their website but if you see something call before you drive over because I think that list is only updated monthly.
Ocean Wreck divers has a Divers flea market in Toms River NJ in February, most of the gear is last year’s stock or rental gear. Since a table cost so much most individuals pool their stuff on a club table. Ray