What's the cheapest item you've got that was still good value?
Cheapest: I went to a secondhand swapping event, you hand in stuff you don't want and get a token for every item they put everything out and then release you to try on. You cash in your token for a different item. I got some black Russell and Bromley lace up boots. So only 'cost' my time and the exchanged item.
Good deals three for one pound baby clothes in Salvation Army charity shop near me
Got some brown Russell and Bromley ankle boots for a tenner at local street jumble sale
Years ago. An electric blue cropped wool jacket for 50p at a friend's community garden summer fair