I bought a seam ripper that I can't live without. I can't remember the name of it, but you can buy it here:
http://www.havelssewing.com/seam-rip...pro-18950.html It is so worth the extra cash. You can buy extra blades, but the blade that came with it still works fine after one year. Gingher makes a similar type seam ripper and I bought it, but the blades aren't sharp at all. It doesn't work well. Don't waste you money on it IMO.