I just bought a wireless shutter release for my D300, purchased from
Gadget Infinity
for $30 US. There are models for a few different cameras and manufacturers.
It’s nice for a few reasons: it’s radio based rather than IR based
(ALTHOUGH it’s my understanding that in some countries, it’s illegal to
use certain radio transmitters that aren’t licensed, so BEWARE), it’s
SIGNFICANTLY cheaper than the equivalent IR based system from Nikon, and finally
it’s cheaper than the same product, relabeled as another manufacturer that is
available in many camera stores. I saw a similar product in a local camera store for
$100 US. It was the exact same product, yet it was $70 more expensive!
It claims 30m distance for use, but I’ve only tested it at about 30 ft —
and it worked fine. If I ever test it at greater distances, I’ll post an
update here.
Gadget Infinity which is based in Hong Kong, shipped the product the next business
day after I placed the order airmail, and it came in about 10 days.