Homebrew PCBs

DJ Delorie wrote:
> You can toner transfer any color you want onto the board *after* you
> etch it to make a silkscreen layer :-)
> 
> But I find that a color laser (I have an HP 2550N) is really handy -
> color coded schematics and board layouts, colored maps from google,
> etc.  You won't regret it.  For business use, spot colors (i.e. color
> just one header, or a logo) can be very effective.

Do colour toner cartridges cost much more than mono ones?