Depends on the condition. I paid $40 for mine and they are in VG condition with intact headband and clean supple pads. At that price (and the guy delivered them to my work) I was very happy.
I always hate to advise this, but look up past auctions on Ebay and you'll see that they sell readily at pretty high prices these days.
As far as sound quality goes I like them a lot after replacing the internal decaying foam and some basic damping with felt behind the driver. Not the best cans in my collection, but very fun and a distinctive presentation.
The seem to be in pretty good shape, but they're pics so who knows really, cant touch them. I did check ebay and the prices seemed kinda all over the place so that's why I asked. Ive seem the sell for probably as high as a hundred or so and as low as 30ish. I saw a few in the 60s and 70 that's didn't sell. Thats why I was curious. didn't seem like the most popular orthos.
They would be my first so I was just wondering if it wasn't a great deal on them if I should just wait for something else.