John Piper has frequently commented on how he is consistently helped by the exegetical work of Henry Alford (1810-1871). For example, "When I’m stumped with a . . . grammatical or syntactical or logical flow [question] in Paul, I go to Henry Alford. Henry Alford mostly answers—he . . . comes closer more consistently than any other human commentator to asking my kinds of questions." Dan Phillips has persuaded Phil Gons and Logos to see if there is interest in making available from Libronix Alford's The Greek Testament: With a Critically Revised Text; a Digest of Various Readings; Marginal References to Verbal and Idiomatic Usage; Prolegomena; and a Critical and Exegetical Commentary (1849-1861).
You can pre-order it for $129.95. (It's basically unavailable in print.)
Dan Phillips has a great post giving more information on Alford, whose life I knew nothing about.