MACGUY posted a few years back about this place that sells the tubing in rolls:
http://www.papermart.com/Templates/p...EY=poly+tubing
I order the 3" to put butts in and the 1 1/2" for shafts. If I deliver a full cue, I seal the shaft in the sleeve, then insert it inside the 3" sleeve with the butt. I bought a cheap $10.00 heat sealer at a local discount store to seal the ends. I also insert one of my business cards inside the 3" sleeve before sealing it up.