We periodically receive a catalog from Christianbook.com. My bride occasionally purchases items from them. Kind of on a whim, I looked at the offerings listed under “Favorite Authors & Theology” (pg 42 of the May/June 2017 catalog) and began noticing at least from the authors I’m familiar with – a trend. For grins and giggles, I began entering into Google the author’s name followed by the word “Calvinist”. As best I can tell from briefly looking through the Google responses, …it appears that perhaps 85% of the authors listed in the catalog write under the “Calvinist banner”. Those with the asterisk after their names are, in my opinion (and based upon my limited findings), Calvinists.
Warren Wiersbe (*)
Wayne Grudem (*)
Jeff Purswell (*)
Elliot Grudem (*)
R.C. Sproul (*)
Charles Hodge (*)
Lewis Sperry Chafer (*)
Arthur W. Pink (*)
Roy B. Zuck (*)
Charles C. Ryrie (*)
William W. Menzies
Stanley M. Horton
Norman Geisler (*)
Millard J. Erickson
D. A. Carson (*)
Jeff Robinson Sr (*)
J. I. Packer (*)
N. T. Wright (*)
Michael Reeves (*)
Martyn Lloyd-Jones (*)
Paul E. Little (*)
Myer Pearlman
Paul Enns (*)
David Horton (*)
J. Edwin Hartill
Gregory Koukl (*)
Tim Challies (*)
Josh Byers (*)
Greg Gilbert (*)
Karl Barth (*)
Francis A. Schaeffer (*)
Geehardus Vos (*)
I don’t know that this means anything, per se, other than at least with this company, there appears to be a preference for books written by Reformed writers.
Martin's Mercurial Musings 
Are you sure about Wiersbe and Geisler?
This is what I found on Wiersbe:
http://gracepreacher.blogspot.com/2011/01/wiersbe-on-calvinism.html
Geisler wrote a book, Chosen But Free, that seem to support most of the elements of Calvinism.
Yes, the Calvinists are prolific writers, and they’re good at it.