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Eerdmans has sharply reduced the price of a good number of their books again. It's common to see books priced at the $1.99 and $2.99 price points, books which no doubt originally sold for many times those amounts. Here's the URL to the hits of a search of their ebooks at Amazon, with prices filtered from low to high (unfortunately, either something is wrong with me, or something is wrong with Amazon, because the search frequently puts higher-priced ebooks ahead of less-expensive ones): https://www.amazon.com/gp/aw/s/ref=is_pn_2?fst=as%3Aoff&rh=n%3A133140011%2Ck%3A"e erdmans"&page=3&sort=price-asc-rank&keywords="eerdmans"&ie=UTF8&qid=1536385344.
These all likely are what the book trade call "backlist" books. Be sure to check the date of publication for each book that you might be interested in--many of them were published quite a few years ago. For some books, that won't matter much; for some books it might.
The previous was a quote from an earlier post; the following is intended to be an addendum to that earlier post of mine:
FWIW (I wonder if Paul Harvey coined the phrase "For What It's Worth?), I learned from one of my super-secret
bargain book sources that the "new" offerings from Eerdmans constitute a "Monthly Sale" by them. Evidently, kismet/serendipity/whatever caused me to catch the reductions very soon after they happened, because the super-secret
bargain book source, that I referred to earlier, posted them about the same time as I did. I'll have to calendar-ize the date of the month.