Note that this is incorrectly named as The Second Barrage box-set on the web site. I have ordered this and received the Complete Barrage set. The picture and the RRP refer to the set which contains both series.
The cheapest I could see the set for elsewhere was £35.99 for the complete set at Amazon and Play or £22.47 for the individual series sets at Amazon and Tesco Entertainment.
The description from MVM's shop (Anime-On-Line) is a follows:
Rokuro Okajima is meek, mundane, and metropolitan. His business trip to South East Asia turns from pleasure cruise to festival of pain when modern-day pirates board the ship and take him hostage. Revy, Dutch and Benny are merciless, maniacal, and mean. Together, they make up the crew of the Black Lagoon. Making a living in a city where the most villainous of villains make themselves at home isn't without its risks, but they take on any job available to them. Smuggling guns, drugs, kidnapped children, and stolen goods is all part of a hard days work.
Contains episodes 1-24 (Black Lagoon 1-12 and Black Lagoon: The Second Barrage 1-12).
Released: February 15th 2010
Running Time: 660mins
Note that this is available for the same price at the rest of the Blah group shops (base.com, 101cd.com & dvd.co.uk)