A little story.
1986, I was looking for glass in Southsea/Portsmouth area. Through the window of a junk shop I thought I could see the edge of a yellow plate in a pile of other plates at the back of the shop.
Unfortunately the shop was closed so back to Newbury, 60miles away. Two days later I drove back to Portsmouth hoping the shop would be open, luckily it was, £3.50 for a perfect Giallo plate.
Pre-internet, pre-Ebay, collecting back then you had to put in the miles. I still have the plate.