AmazonBasics Wireless Remote Control for Nikon DP7000, D3000, D40, D40x, D50, D5000, D60, D70, D7000, D70s, D80 and D90 (Camera Photos)
Inexpensive but effective with my Nikon D3200. I tested inside to 7.5m (due to the wall behind me; -0) and it still works. A good alternative to the original Nikon remote control.