RC18T metal geared servo

[LEGEND]

Hi there i am wanting a metal geared servo that would fit in a 18th scale ,as my current servo has suddenly stopped working and would like to have a new one just so i could use my RC18T when i want to. It doesn't have to be too expensive. I would be willing to pay up to £20 at most. I have checked some shops but would like to see if i could get a better deal off of someone for a second-hand one. I am in no hurry so there is no need to rush to get replies in.