It's the smaller version called "dwarf airship", released in 2002 and apparently sold out in August 2007. Here's an
archive page showing it. Used to be "only" £18-£20. Then there's a bunch of extra bits and conversion work, of course.
£105 for a GD-ranking model... Kind of reasonable if you're the kind of buyer who appreciates official FW models, GD paintjobs and overall GW atmosphere. I wouldn't sell my most time-consuming conversions for much less. There's quite likely dozens of hours of work put there. Doesn't give you any spectacular wage, does it?
Oh well, I prefer doing my own hobby projects to buying them finished. Others have more money than free time (or skill) so let them spend it. Everyone ends up happy.
I must also say that the photography isn't quite on the level a GD finalist would deserve. The painter was lucky to get that good a price.