Probably worth keeping an eye out at op shops and Savers and the like as Happy Meal toys routinely pop up there in the weeks and months (even years) after their release. I've picked up a few that way over the years.
Of course, it's a crap shoot whether they turn up at all and in what condition and levels of completeness.
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So, these are apparently showing up in Europe as well, at least most of them. I bought a set from a seller in Turkey, but it only includes Optimus Prime, Bumblebee, Grimlock, and Strongarm. They aren't getting Drift. So, if anyone has an extra Drift for sale, let me know, and if you need a set of the other four, take a look here:
http://www.ebay.com/itm/112333670537...%3AMEBIDX%3AIT
The seller also has singles up. FYI, I offered $19.99 for a set and it was accepted with free shipping.
Thanks,
Lewis