Take a look what i just found at amazon (yes i am often there 
)
Their description:
Product Description
The epic story of Lost twists, turns and time shifts in its brilliant fifth season. Packed with bonus material, including a revealing interview with the cast and an exclusive behind the scenes fetaure with Josh, Lost is better than ever.
When destiny calls, the Oceanic 6 frantically race back to the island. Discover what forced them to return and find out the fate of all those who were left behind. The answers to some of Lost’s most pressing questions are rev… More >>
Go & get it here - i can recommend it:
Lost: The Complete Fifth Season