MANA: Are Mana Soundframes still worth anything?

...... but just wondering if Mana Soundframes are still worth anything, or enough to bother getting a few quid for. I've got 2, with 2 bits of the wood and one, maybe bits of the glass. Been in the loft for a few years, so the brassy bits are dulled over. If they're worth £100 quid or so, I can start getting some stuff together to sell them on. Is there still a market for them?