Is it one of those 'Fashion' ones? I'm all for it, the clothes - from enforced browsing- look barely used in the equivalent in Barnes. Better they make the money than the 'vintage' shops.
I think the days of getting a bargain in Oxfam are long gone. Their record pricing is clearly "we read discogs now you prick, we know what you should be paying".
My nearest Oxfam, which is in Herne Hill, styles itself as being in Dulwich Village. Its pricing is ridiculous.
I am pretty sure that a (red?) Le Creuset teapot in there would be ticketed at above retail price.
(I've helpfully italicised any snippets of this post that you may want to consider quoting below.)