Personally, I rather doubt Amazon will price-match these.
The non-Harlequin books are all from e-publisher RosettaBooks, which is a small, non-Agency outfit (still sold on Fictionwise) that republishes "modern classics" (non-US-PD older stuff like Vonnegut, Solzhenitsyn, Orwell, some Heinlein and Douglas Adams) and they're probably not bound by Amazon's special royalty rate rules about not having your books at a lower price at another site which caused Smashwords to go Agency.
While Amazon's free to set their own pricing on RosettaBooks' books, technically, these aren't even on sale at a lower price, simply offered promotionally free with an account signup + download/install of their software. So it would be kind of like price-matching one of those "Buy a new Kobo/Sony, get copy of X book free" (Kobo did this for some stuff by Canadian authors like Linden MacIntyre and Margaret Atwood).
But you never know. Maybe they will.
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