You will be better off with a Tokina 10-17mm Zoom Fisheye for your Nikon. by virtue that the Tokina is a Fisheye and the Sigma 10-22mm is only a wide angle lens.
I know some people in the UK have had luck ordering from http://www.onestop-digital.com/
from hong kong 370 pounds delivered. They guarantee to refund any import duty at least for the uk, ireland as well maybe? Often arrives in less than a week.
But perhaps you meant you couldn't borrow or rent one as it seems strange you couldn't find one, they don't seem to be in particularly short supply, By mail order anyway.
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