Intertape 510. With some digging around you can find it for 6 ish a roll.
Another vote for intertape...we use the 570...not sure the difference. I buy them from staples with coupon codes. Last time I paid 1.65 a roll.
Intertape 570 2 x 110 yds Carton Sealing Tape Clear 36 Roll
Item: 1074591
Price
$70.29
Qty.
2
Coupon
-$28.12
20% off regular-priced office supplies including paper, ink and toner.
Subtotal
$112.46