Staples.com has this a great deal, you are getting 6 rolls at a cost of $1.28 per roll!

6 Rolls of Staples Packing Tape
  • Acrylic adhesive packing tape
  • 2.4 mil thickness
  • 1.88″ x 54.6 yards
  • 3″ core to be used with any standard dispenser
  • 6 rolls/pack
  • Meets U.S. postal regulations for standard packages
  • Temperature resistant for wide temperature range application (-10 degrees to 150 degrees F)
  • Clear tape is ideal for label protection
  • Packing tape with strong holding power to ensure a secure seal
  • 28 lb. per inch tensile strength