Spike has a few toys now, even in Human Alliance. Yet Buster has no toys at all. Whats up with that? Yes, yes... because Spike was a cartoon character. But even so, Buster wasn't exactlly an obscure character in the comics.
He might get a toy in the Human Alliance line now that Hasbro is running out of names for the human figures. Roadbuster got a human alliance toy and his rider has no name.
Spike only just got his very first figure (not including Fort Max) There is a long list of people you will see long before Buster. Buster is a comic only character and Hasbro's main medium is TV.
Including Fort Max, there are three. G1 Fort Max Headmaster Spike MP-10 Spike Human Alliance Spike Witwicky that comes with Basic Backfire
I dropped out of the movie line with the third movie so I didn;t know about the third. But once again SPIKE is like THE human in Transformers. I don;t think a Buster will show up until after all the other show humans are made first.