I love that same time period of the 90's. While I don't agree that there wasn't much of interest or value during that time, I believe Sturgeon's Law ("90% of everything is ") applies to every era of comic OA. In this hobby, however, quality isn't the primary guiding force. If you loved a particular comic when you were ten, you want a page from it today.
Just because the old school collectors dismiss that decade, it doesn't mean they're right. There are a growing number of fans who want the same pages you're seeking. When they buy a piece, they often hold onto it. I've bought or seen offered pages from many of the stories you've listed (not Bone, though), but you have to hunt.
Here's a lead, if you want to chase it: Antonio DB is offering an SiP page here -- http://www.comicartfans.com/gallerypiece.asp?piece=1326767 -- if you're interested. But, yeah, the pages are hard to find.