The Deluxe Titan Masters seem to be selling like hot cakes! Reminds me of the original RiD figures back in 2001 when they were similarly flying off shelves. And just like RiD, TR doesn't even have a current TV show to market it, as opposed to the slower selling Movieverse and current RiD toys, which goes to show that good toys will sell themselves regardless of the existence of a screen media or not.
Hardhead seems to be the most difficult to find. I was looking for another one (for a friend) and I called around several stores before I finally found one, and it was the last one there.
Yes, I recognise that unlike Car Robot/RiD, Titans Return is based heavily off some 30 years' worth of G1 nostalgia. But CR/RiD wasn't, and neither was Beast Wars when it first came out*. And of course, even G1 itself was already selling strongly at first before the cartoon took hold.** That's why I'm not a big fan of Transformers toys being modelled after screen models (i.e. Transformers being made as merchandise for a show or film), rather I prefer it when shows and films are created as 'merchandise' for the toys. Because even if the show or movie tanks, we can still have good toys; but if a show or movie is bad then all we're left with are bad shows and mediocre toys. Just look at Combiner Wars. It's using models based off CHUGUR and MP toys. I'm not a huge fan of the show, but the toys that it's based off are still awesome. I'm sure that there are Lego fans who may not love the Lego Movie but still enjoy playing with Lego. :)
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*Within its first year Beast Wars had elevated Transformers to become the 3rd best selling action figure line after Toy Story and Star Wars.
**Transformers had grossed US$100 million (or about US$232 million/AU$303 million by today's standards) in 1984.