It could start out at any price...
I used to be into stylish keyboards and mice...had the original Logitech Mouseman/Keyboard combo...$150...broke down in an year.
Then Logitech MX Duo KB/MX700 Mouse...another $100...keyboard died in two years, the recharging contacts corroded.
Logitech Dinovo KB/MX900 Mouse combo...$250. I got robbed...along with 2001FP monitor, Ipod, Klipsch 2.1 speakers...an Athena 5.1 setup...$300 DVD Player...$1050 worth of DVDs...$400 video camera...250gb external drive...Sennheiser HD600s...all in all, I got raped by about $10k in half an hour of being away. Yahoo!
Five years and $500 of Logitech later...I'm on a Dynex $20 keyboard and mouse. And happy. Coz in fact, functionality is about the same as the Logitechs (all the Microsoft-style Windows functionality buttons are there). Yay!