As far as I know, I'm afraid you are stuck with ordering on-line. But both Decalgirl and Gelaskins have really nice skins, and outstanding customer service, so you should be good

. Just one thing though: Decalgirl offer a matte or glossy finish option, while Gelaskins only offers glossy (although their CS just told me that they were very seriously looking into making a matte finish available soon!). I also found that the Decalgirl design were always a bit darker in real than they appeared on my screen online (but that may just be my screen settings

).
Have fun choosing your new skin!