Oak Leaf via Amazon offers its Oak Leaf 10-Foot Tree Swing Hanging Kit for $16.99. Coupon code "NOUHGW8Y" knocks it to $13.99. Plus, Prime members receive free shipping. That's $3 off and the best price we could find. This kit supports up to 1,100 lbs. and includes a 2"-wide weather-resistant strap and two stainless steel carabiners (one standard and one swivel). Deal ends March 31.