For anyone interested in buying the set, I found it on craig's list: http://dallas.craigslist.org/dal/bks/881054527.html

I do not know the seller, nor am I vouching for him or her.

Here's some prices I've noted (on eBay) over the past few years:

In 2006:
£57
£110 no slipcase
£97 no slipcase
£140
£73
In 2007:
£112 no slipcase
In 2008:
£56
£283 still sealed

Also wanted a set; but prices have always been highly variable I think.

BH