okay people need to list their best finds in second hand record shops. the more obscure the better.
in a tiny oxfam in southampton i found a signed copy of reign in blood by slayer on vinyl in mint condition. 50p.
also there's a southampton record fair that when you enter with a flyer you get to take a free cd from a huge box of promos/old singles. i got the muse muscle museum ep and a year later sold it on ebay for £70. nice.