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You can find their entire line of ebook at Amazon and Barnes & Noble. As always, I recommend sampling first, but I know that the PDF editions of ebooks I've downloaded from Tantor have been well formatted in the past and the samples I checked on Kindle appear to be the same (and not just scanned in, OCR'd text or converted PDF's).
If you are in the mood for an audiobook instead, their March Madness sale is still going on and there are 81 titles still at $6.99. I haven't really looked thru it, but see a Peter Robinson title near the top of the list that looks interesting.