Amazon offers the 3M Scotch Heavy-Duty Packaging Tape with Dispenser 6-Pack, model no. 142-6, for $9.86. Check out via Subscribe & Save to cut it to $8.38 and bag free shipping. That's a buck below last month's mention and $4 under what you'd pay in-store locally. Each roll contains 800" of 1.88"-width tape.
Note: Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.