Wanted: cheap way to get a stainless Exhaust in the UK

[Atroxian]

Hey, I recently bought my first motorcycle and it happens to be a 2002 GS500 non-e. I have bought it from about 500 miles away so i have only seen pictures and the description that states its not roadworthy and its being delivered to my house in the next few weeks. I did notice on previous MOT data that it has a small exhaust leak at the front of exhaust. looking at the pictures the silencer is dented and the pipe itsself is rusty as heck. I saw online that they are often changed to a stainless system and the ones on ebay seem to be around 300GBP. Is that how much i should be buying them for? Is there a way to find second hand stainless exhausts in the uk? any information would be fantastic.