Key stuck in ignition barrel

[jamdan]

Hi, my car is a 1999 Saxo 1.1 and the key is jammed in the ignition barrel. I was unable to turn off the engine and had to stall the car. Not sure whether this is related but last week my heater/blower stopped working, and then today for some reason they started working again, but when I came to park the car the ignition key was totally jammed leaving me unable to turn off the engine.
I have been told by Citreon that I need a 'full new lock set' which I cannot afford. Is their a cheaper way i.e. 2nd hand ignition barrel, and if so how do i remove the barrel whilst the key is jammed?
Any help/advice would be greatly appreciated....!