Amazon offers the Duck HD Clear Heavy Duty Packaging Tape 6-Pack for $10.99. Checkout via Subscribe & Save to cut that to $9.34. With free shipping, that's pennies under our May mention and the lowest price we've seen. (It's also about $2 less than what you'd expect to pay for this at a local retail store today.) The adhesive bond strengthens over time for a long-lasting hold, and meets postal regulations.

Note: Be sure to cancel Subscribe & Save after your item ships to avoid being billed for future shipments.