Meritline offers this Wireless Remote Control for Nikon Digital SLR Cameras
with free shipping
. That's the lowest total price we could find by $3. It's compatible with Nikon digital SLR cameras, including the D90, D80, D70S, D70, D60, D50, D40, and D40X. It can trigger a camera's shutter release via a built-in infrared receiver.
Expect this item to take two to three weeks to arrive.