No luck on Camshaft. I got Prime, Mirage, and Meister through HTS, and while I had a preorder for those three and Camshaft at BBTS, I just couldn't resist the $15 Alts and free shipping. I can do without those common cars as Transformers. If I buy Alts, it has to be a character I want (which explains why I own Prime) or a model of exotic car that I'd like to have a 1:24 scale version of (which is why I own Rollbar. That and I never got my hands on Hound.)
I haven't looked around on ebay for any longer stacks, and I agree with the tinyness. I'm really doubtful toy safety laws prohibit them, but I guess short stacks would be better than rubbery stacks.
I'm holding off until I hear an announcement that Starscream will be coming stateside. This is a good chance for Hasbro to outdo Takara by offering a properly-painted Starscream. But I'm afraid Hasbro's plate is going to be too full with the movie line, and it's not like the 20th Prime is setting sales records.
If I did buy any repaints of this mold, they would just be Thundercracker and Skywarp. I doubt they'll be able to get that much mileage out of this mold, however. Look at all the problems the Prime mold is having.