My best quilting find at a yard sale was unopened boxes of pre filled bobbins. Each box held 72 bobbins of class 15 Superior Sew Fine and cotton Super Bobs. I got boxes of white and lots of colors. I bought ten boxes for $10. The young woman who had the yard sale said they were in a box of miscellaneous items she bought at an auction. One box sells for $65 now. I shared with my quilting friends.