They come on ebay UK once in a while priced around £1,800 to £2,500 depending on model i.e. QBD76 to QBD76HD to QBD76HDSD.
UK company Nintronics had an ex demo QBD76HDSD for sale at £2,700 last week...... a bargain. I don't know if anybody bought it but's its currently not listed.
There is also a Blu CD Transporter for sale on ebay UK for £2,390 at the moment. Link this to a QBD76 for dual digital output for sonic bliss !
I often look in HiFi Shark which lists items from all over the world. I bought my second Blu with a Chord Prima Pre-amp and 4 tier Aspire Stand second hand via a private sale from a great guy in Europe for my UK headphone system last year for an amazing great price.
You just have to keep looking on a day by day basis via the world internet.