I bought a giant cone of thread from a discount fabric store for $1. It turned out to be very brittle and breaks easily, couldn't use it in the serger at all. But then I had to make several muslins (toiles) whatever you want to call it, mock ups is my favorite term, for a client. And I found a use for it, it breaks easily so I just rip the pieces apart easily. There is always a silver lining in every cloud.