The least amount I've spent is zero. I made it out of scraps, leftover batting and thread (Poly thread given to me by my Mom c1983). Even the back was leftover flannel from another quilt. It was part of a challenge one summer at the Scrapbusters list to use something that didn't require any purchasing, but I went further to use up stuff that would be considered recycled. I tied it using wool leftover from tying another quilt. It was a mystery quilt and some of my choices of fabric didn't bring the design out that well. This was a lap sized quilt.
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