i was thinking of the same thing so i did some searches on a few forums and alot of guys used a mini chopsaw from harbor frieght... i just picked one up today for 25 bux..and tested it on a carbon goldtip arrow that i split a while ago.. thing works like a champ!!!!!!

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=42307

thats the saw i picked up.. a guy at work told me he used a VERY sharp pipe cutter and worked well..but just gotta go very slow when you cut

this saw works really well.. tested it about 10 times (cut off 1/4" off the bad arrow) and every time it cut really well.. very clean cut

hope this helps!