Renting Sigma superzoom lenses

[deltatango]

Hi all,

I've been seeing with interest a number of superzoom lenses by Sigma that I would like to try out e.g. 50-500, 120-300 f2.8 etc with my Nikon body but it seems like most camera shops only carry Nikon lenses and a few common standard Sigmas. Anyone knows of any place to rent these zooms?

Thanks in advance.