Before I had an arrow saw, I always used a small pipe cutter. Now, I was cutting aluminum arrows at the time but I would think it would work on carbons as well, if that's what you're shooting. I would not use a jig saw on carbon arrows because of the splintering issue. Be careful. Here is a link to a small pipe cutter so you can see what it looks like. Good luck.
http://cgi.ebay.com/Mini-Tubing-Cutt...item35b12f8736
Blessings......Pastorjim