REI offers the Gibbon 98-Foot Surfer Line Slackline Kit in "Blue" for $54.73 with free shipping. That's the lowest total price we could find by $30. It weighs 10.8 lbs. and features a long-lever ratchet and 6-foot ratchet band for adjustable tension.
Note: Although this item is advertised as blue, many other sellers note it as purple.