Looking for jewelry at sales

For years I've been looking for a black and white or just black necklace. I rarely wear jewelry. I discovered that coral, teal and off white are popular, but black went out a few years ago. So yesterday at the antique sale at Lakeside I browsed all the costume jewelry booths. I found one for $8.50 and one for $20, but didn't buy them. I went back in the afternoon after the rain thinking I'd buy the cheaper one, but of course it was gone. $20 was still available. So I moved on to the soggy (we'd had a real downpour) $1.00 box out on the lawn and found 2 for $1.00 each.