Cordless microphone / usb connection for windows laptop

[Polar Bear]

I'm about to acquire a nice new laptop with Dragon Naturally Speaking.  It also comes with a flash cordless dect USB headset.  I would like to have just a microphone to use with it so that I can clip the mic to a lapel for instance enabling me to keep a 'voice to text' output of my upcoming lectures and presentations.

Anybody know of any such devices that have a good range and will not break the bank please?   

[Polar Bear]

Bump.  I've discovered that the laptop* also has a standard microphone socket so any cordless device for a 3.5mm jack or a USB if anybody knows of one would be helpful, please?

* It is being supplied and arrives next Wednesday.  As I'm not paying for it I didn't get to choose it.