where do i find a replacment foot for a A.E.G model 623 sewing machine?

ive been looking on the internet and in various shops to find a replacement foot for my A.E.G Sewing machine, its model 623. If there is any way that you stock them that would be very much appreciate and if so how much for the item and postage cost's. If not is there any where i would be able to find it, just its proving to be difficult and im not experienced in finding parts.