Pretty wild; I've seen Duran Duran - Astronaut SACD fetch $200 a time or two on ebay. Have seen Amazon DVD-A & SACD skyhigh prices for Hotel California and Rumours to name a couple.
Had a run in with an eBay seller who listed currently available new In The Court Of The Crimson King CD/DVD-A for $59! The reason I contacted him was that he insisted on using "like SACD" in the listing. Thinking he was another seller who didn't know a DTS from a DVD-A, I recommended playing up DVD-A and not SACD to be accurate. He jumped my ass and called me a fool. Right, like he's ever gonna sell any at that price much less take them back as wrong format. Jerk.