Amazon has the Yaheetech 8-foot Sliding Barn Door Hardware Kit for $55 - $17 off with coupon 9WK9SOU2 = $38 with free shipping. Features 220-lb. door weight capacity, rubber cushion doorstops, anti-bounce.
Has good Amazon Reviews.
eBay has the Open-Box Worx 8" 2-in-1 Electric Pole Saw & Chainsaw (WG310) for $48 with free shipping. List price: $140. Features 8-amp motor, 8" bar length, 8-foot extension pole.