I know a few of us took advantage of Lee Valley's few 'days-o-free-shipping' to stock up on those things we just can't afford to order separately. Along with a few other little things I took them up on the bag of 100 1/4" bullet catches without strikes for $6 or whatever it was.
I figured I could use them for something and then recalled someone posting about using them on shop made dogs. Oooooooh, variable height dogs . . . Cool idea, although not mine.