Excellent used copies of the 8/f2.8 AIS are sold in the US for $1800. KEH.com has them most of the time, and I can't remember seeing them go over $2099. Even with import duties these will be less expensive than the $3300 that you're being quoted. Hmm... they only have an ugly one at ($1120) at the moment.
Frankly a choice that is very competitive is a new Sigma 8/f3.5 or a slightly older (~1 year) Sigma 8/f4. These are not quite as sharp as the Nikkor - I rented an 8/f2.8 before I bought my 8/f4 Sigma.
However, the Sigmas are a ***LOT*** smaller and don't need anywhere near the coddling to transport. The 8/f3.5 weighs 400g and measures 74x69mm, while the Nikkor weighs 1100g and measures 123x128. The Nikkor looks like a monolith rising out of the camera bag - seriously, it takes up almost as much space in the bag as D3 with a small lens.
And as you might guess the Sigmas are also vastly less expensive. I picked up an 8/f4 (with an aperture ring, as my FX cameras are all MF!) for under $400 at KEH. A new 8/f3.5 runs about $600 at B&H and presumably about $800 new in the UK. They're AF too, although that's of minor value in an 8mm fisheye.
