My parents had a guy come around and offer a framed pic of the house for £30.
They said it was too expensive (it was) and he went away. Two days later he knocked again and offered it for a tenner.
We got it.
In talking to the chap it appeared that he needed any cash he could get, as his business wasn't doing too well as most poeple didn't want to shell out the cash. This guy used a 152 with two of them on board and they had photograhed a larde portion of the neighbourhood.
Having said that, commission work would be very different than cold calling.
Good luck.
PS this was in NE London.