MSRP on them when they first came out was around $3000 for the pair. Usual street price was $2000.
Ebay pricing on them now I would say would be less than a grand. They never got a huge following to keep the prices up like some B&W or PSB models.
I am a fan of Wharfedales. I have the Opus 2 Center and the EVO2 50's which have a similar driver configuration to the Opus line.