Other free sources inclued: friends from quilting groups or guilds, and the public library.
I love to finish some of my quilting projects with the wooly yarn on the edge. Made several little holdalls and they were really easy to make and finish ... all on the serger.
Martha Pullen had a PBS TV show airing where I live but I expect you might be able to find more online about her and her guest projects using sergers.
Nancy Ziemann also has great ideas.
I learned how to put in a zipper on the serger and it was neat.
ali