I have a set to sell for $80, installed once and still in mint condition, it's the world famous Grover after all.
New set costs around $130 shipped http://www.ebay.com.sg/itm/Grover-Mini-Locking-Rotomatic-R-Tuners-3-3-Black-Chr-/320681016039
New set costs around $130 shipped http://www.ebay.com.sg/itm/Grover-Mini-Locking-Rotomatic-R-Tuners-3-3-Black-Chr-/320681016039