Bear -
Heck, there's a bunch of compilations of classic scifi as well.
Anvil,
Laumer,
Lenister,
Godwin and
Schmitz - all free library ebooks.
It's not all milscifi by any means, that's just Baen's most visible product (that's only part of the free selection...).
charleski - It's pretty amazing how closely the Book industry is repeating the mistakes of the Games industry, down to the fixed chunk taken by the publisher/platform holder.