Tenimyu help anyone?

Soooo...Tenimyu fans. I'm gonna be doing a sales post soon, and I'm selling some of my old CDs (More than Limit, DL1, blah). Unfortunately, I have no idea what CDs go for these days, and my preliminary research over at tenimyu and tenipuri_myu hasn't turned up any useful info. Anyone know, because I'm pretty sure the original 2800Y price tag these CDs have won't fly.

Also selling all of my Gackt CDs. All 12 of them. I have a harder time justifying reasons to keep CDs over books; CDs can be burned, and once you have a digital copy, there's hardly any need for the actual CD anymore (when was the last time YOU used a CD player and not your iPod?). Since my eyes are bad and stuff, I try to stay away from reading scans online all day (though with this new Readability thing recommended by star_keziah, reading fics online has become SO much easier).

Ah, market research. You confound me to no end. Sometimes, there's no information to be found (how much DOES a Pandora Hearts doujinshi go for anyway?). And sometimes, the fandom's so old that you're lucky to give things away (darn you, Prince of Tennis!). I don't know if this means I'd be a good entrepreneur, or a horrible one. @__@