http://www.logitech.com/index.cfm/ke...s/164&cl=us,en its hard to find this mouse without buying the keyboard too. I think i got my last one from sams club. The MX 1000 wasnt sensitive enough no matter how i tried it. Just didnt move as smooth as my regular MX. The only reason i bought the mx 1000 was cause i was out of town on a job and needed a good mouse for my laptop.