No idea on local stores, but you might check out the SD Strobist group on Flickr. I think there are a few guys there using the 530 super. You might be able to meet up with one of them to give it a test run.

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Check out the San Diego Strobist Meetup!

Throw a little light. If it doesn't come back, it probably fell off...
Cheers
John
Flickr
Nikon D80 (nicknamed Cylopsoid)
Tamron 17-50mm f2.8 Lovin' it. I could glue it to my camera and be happy.
Tamron 28-75mm f2.8 It's the older model w/o the AF motor and it focuses FAST. It's just like the 17-50, only longer.
Nikkor 50mm f1.8d <------creammmmmy
Nikkor 18-55 kit Now in a deep slumber.
Quantaray 28-82 Somewhere in the house.
Nikon N65 Back for the resurrection tour! Coming to defend the faith...
(This spot being saved for hopefully a G9 or G11) Shhhh, I know those are Canons...