Cheapest I can find out there for these DVDs and Blu-Rays - Amazon is £8.99 and £9.99. Seems to be part of a bigger offer which has some of Amazon's Black Friday deals in it too.
Blurb from eBay:
Motorcycle road racing is the most dangerous of all motor sports. A sport in which men compete at speeds of up to 200 miles per hour on closed country roads. Roads that on any other day service cars, buses, tractors. Roads that are lined with trees, telegraph posts and stone walls. Unforgiving obstacles when struck by the human body. It is a sport that has claimed many lives over the years and continues to do so to this day. Ireland and the Isle of Man are two of the few places in the world where the sport still survives. Narrated by Liam Neeson, ROAD is the heartbreaking and adrenaline-fuelled tale of a family who have dominated road racing for over thirty years. Robert and Joey Dunlop. Quiet men from a rural village in Northern Ireland - but racers who risked everything to win. And Robert s sons, William and Michael. Two of the world s leading road racers today. Young men determined to continue a family tradition. Featuring stunning action, candid race day scenes and a gripping narrative, Road is the story of two generations of one family that have been united by success. And united by tragedy. **** - EMPIRE Crammed with gasp-inducing race footage, this motor sports doc enters the death-or-glory world of road racing, as told through the Dunlops, a dynasty of champions with Castrol GTX for blood. What emerges is a saga of valiant masochists, as adrenalin-pumped and emotionally draining as any blockbuster. Liam Neeson's narration piles on the gravitas. **** - TOTAL FILM Dermot Lavery and Michael Hewitt's documentary does for motorcycle road racing what 'Senna' did for Formula One, capturing the sport's thrills via one family's scarcely believable human drama. It's a high-speed saga of catastrophes and comebacks, tragedies and triumphs, building to an astonishing emotional pay-off.