For any price, you get:

Peter Brett
Harlan Ellison
Caitlin Kiernan
Cherie Priest
Dan Simmons
Connie Willis
Jack Vance
Kick in more than the average amount for the bundle, and you also get:

Kelly Armstrong
Clive Barker
Ted Chiang
Maria Dahvana Headley and Kat Howard
Barry Hughart
Tim Powers
John Scalzi

And if you pay more than $ 15, you also get:

Joe Lansdale
Robert McCammon
K.J. Parker

For me, the sweet spot was $ 1. 🙂 The Vance and Ellison collections themselves are worth $ 5 and $ 10 on Amazon, and these are DRM copies in PDF, EPUB, and MOBI formats.