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BP is up on TFsource for people who want to use them instead of BBTS, for the same price of $160, which, considering it's about $145 directly from TTMall, and TFsource does free shipping over $150, is actually an extremely reasonable price for an import-only exclusive of this kind.
Additionally, why the heck aren't combining alt. modes more of a common thing in Transformers? Like, it actually makes more sense than standard combiners, which just make a giant, retarded humanoid that is still only as durable as the bots that make it up. Combining alt. modes is actually a way to build a vehicle that can serve multiple purposes and allow for more utility than the individual modes have, like with BP, a jet, a tank and a jet-tank combine into a space-faring dreadnought, which is not only more useful/capable than the individual modes, but can also serve as transportation/firepower for smaller bots to take advantage of.