One thing I have noticed here is how high most of the charity shops (at least in Blackburn) seem to be. I have seen things a lot higher for what something comparable would be in places like Matalan, brand new. I know the money goes for a good cause, but I can't justify paying more for used than I would for new.
What I loved about the last town I lived in there were a lot of rich people and a lot of people who pretended to be rich (lots of debt, but hey, I can pretend to be rich types) so there were loads of name brand clothes worn once, or still with the tags on at Goodwill and Salvation Army. Plus, you can always count on Elder Beerman's very, very end of the season clearances to have things that used to be $50 and up for $1 - $3.