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I was wondering what comes in the chaos biker box.  Specifically, I was wondering about accessories like plasma/melta guns that are supposed to be able to be mounted on the bike. 

Does the bike come with a special weapon, or is it easily modifiable (by pretty much a novice) to install one instead of the twin-linked bolters?

The Chaos Bikes are packaged the same as the Marine bikes... The single bike only comes with the plastic sprue, which only has the bolters. The Squadron box includes extra metal parts, including one each of the melta and plasma gun.

So how do you get the squadron box?

If you can't find any in your local store (fairly sure it's one of the boxes they pulled from the general range, at least here in Oz), you're probably stuck with UK mail order.