Given the number of times some records have been reissued in the CD era — the new editions of Blondie’s Parallel Lines and Elvis Costello’s This Year’s Model are, what, the sixth or seventh? — it’s startling that the early years of U2, the off-and-on biggest rock band on Earth, are only now getting the deluxe reissue treatment. Boy, October and War were all just released in $35 hardbound packages combining the remastered original album with a second disc offering live tracks, remixes and B-sides. Though the discs are available everywhere (and, happily, are also available as single-CD $11 budget titles without the bonus tracks), Amazon is offering a brand-new exclusive boxed set, which features a bonus limited-edition poster and room for a fourth disc to come — maybe a new version of the Under a Blood Red Sky EP, which was the most successful live record in British history?