Sorry to do such a girlie thing as a thread about shopping!
I actually hate clothes shopping most of the time, but can spend hours browsing in Op Shops and my best bargain of the week this week is a lovely Maxwell Williams china mug, still had it's original price tag on the bottom ($7.95) so never been used, for only $1! It's huge (well, bigger than a normal mug), and has red stars and gold dots on it and is really fine china (I do like my tea out of fine china!) and I'm really pleased with it (you may have guessed this!)
So come on, what's your best op shop bargain?