Digital BW, The Print

Friends I print on an Epson R2400. The maximum stock width is 13". For 
my best, I print on Epson UltraSmooth 13x19 which rings in at $4 per 
sheet. Unfortunately, the narrowest roll stock is 17". There is a 44" 
roll that, cut in  3 13" segments would give me 150 feet, at around $1 
less per foot. And it would be more econmical because there would be 
no waste in the length as there is with the pre-cut stock. Any 
suggestions as to how to get this cut professionally. I have a chain 
saw. I am looking for something a bit more accurate. Thanks