What do you call decent?
Dysons price is £32 (only purple trim ones are left). We couldn't shave much off that for a new one as there isn't much in them, and they cost about a fiver to send as they are over length for the Post Office.
We generally charge £20 delivered for a mint used one. Which is about £14 plus costs. DC03 stuff is getting thin on the ground now and starting to be phased out. It will start to go up in value quite soon as it becomes obsolete.
That may be more than you want to pay, and if anyone has one knocking about they are free to chime in. I only put it out there as an option.