After the second series, BMW made the DVD availible for purchase to owners. I have the whole set, and I bet you could find it on E-Bay.
"Star" is great, but "Star" in 5.1 surround on my big screen, well thats the way it was meant to be.
The first season all featured different directors and cars;
(Stolen from Wipedia
https://en.wikipedia.org/wiki/The_Hire )
"Ambush" - John Frankenheimer 7-Series
"Chosen" - Ang Lee - 5-Series
"The Follow" - Wong Kar-wai - 3-Series and the Z3 roadster This one starred Mickey Rourke and Forest Whitaker
"Star" - Guy Ritchie - M5
"Powder Keg" - Alejandro González Iñárritu - X5
The second season was all about the Z4 and was produced by Ridley Scott
"Hostage" - John Woo also starring Maury Chaykin and Kathryn Morris (Cold Case)
"Ticker" - Joe Carnahan and stars Don Cheadle as well as Ray Liotta, F. Murray Abraham and Dennis Haysbert (24 and the Unit). This is actually my favorite
"Beat The Devil" - Tony Scott starring of course, James Brown, and Gary Oldman. Also has Danny Trejo (the guy with the Lady of Guadaloupe tattoo on his chest from all the Robert Rodriegez films) and Marilyn Manson
If you get the chance to see these on DVD, its pretty cool, but I bet a lot can be found on YouTube or the like.