Well, he has slowly lowered his price every couple weeks, and now has an ad for $230, if I remember correctly. I also found this info online, making them sound pretty sweet. It could also explain why the tweeters don't work for him...
The SAE Mark XII is an electrostatic speaker.
James Wong (March 23, 2005): These were sold during the mid 70's and are very high quality. It's a three way design with an electrostatic top end, a 5" mid, and an awesome 12" woofer.
They need to be plugged into a wall outlet to energize the stats. They needed a minute or so for an internal relay to kick on. A super heavy duty GAUSS woofer which probably contributes to almost half the weight of the entire speaker. The woofer's got a rolled cloth surround so it should lt should last forever.
The crossover allows for a choice of crossover frequencies and levels.They're big{27" x 17" x12.5" deep} and weigh 66lbs.each.