I have Barrowmaze. Arden[sic] Vul rings a bell but I can't place it.
Barrowmaze is a quality dungeon, but I tend to avoid megadungeons (particularly the OSR kind) because: 1. They often veer into the super-strange and/or goofy gonzo stuff and that's what turned me off of Rappun despite it being a solid book. 2. They commonly include sci-fi elements (a major pet-peeve for me in fantasy RPGs). 3. And finally, the primary reason, is that they're extremely difficult to run well and keep the players interested/engaged. Even if you do run them well they are incredibly taxing on the DM because you're often stuck in a continuous loop of responding to player inquiries and environment narration. Whereas in other campaign types, I find I am able to take a few minutes to be silent, go over my notes, and mentally rest/prepare for the next potential scene/encounter.
Some people really dig the super-old-school playstyle of room-clearing simulator where you just kill things and take their stuff week after week, but that kind of gameplay is dreadfully boring to me and the vast majority of my players haven't wanted to spend 15 straight game sessions in the same dungeon. Granted, a fair number of the modules are designed for the party to come out and refurbish, but it's really not much of a change in scenery/play.
I have quite a few megadungeons that you didn't mention. I purchased them because I'm collector nut, but haven't read them. However, I can name them if you're just interested in leads.