You have the three-volume «Les heures grégoriennes»: more information here. This was already mentioned in this forum in this discussion. These books contain everything you need for all hours bar the Office of Readings (the OF mutation of Matins). I never saw the books, but comments are generaly positive and there is a set of CDs with all chants recorded.

But 1) these volumes include a French translation, not an English translation, and 2) they will cost you 340 US$ (or 215 € if you prefer).

For the hymns, there is the «Liber hymnarius». (Google that to find lots of sellers.)

On the other hand, you can try to do it yourself. Download the Ordo cantus officii. For all things not covered by this Ordo, use the Liturgia Horarum, which you can find online, in Latin, in its entirety, in this site. Then you just have to find the hymns and the antiphons (the other elements are trivial). Most hymns and antiphons can be found in the 1912 Antiphonale (actually Diurnale); a few more you'll find in the 1961 Liber Usualis. But not everything is found there. You'll find some more in Dominican Rite chant books which you can download here (yes, I know that Dominican chant books differ from Roman ones, but not that much, and when you can't find an antiphon anywhere else it's really not a bad idea to use them), or in this edition of Sarum rite chants (similar comments apply). There used to be some useful collections of antiphons by Holger Peter Sandhofe (who organised a Nocturnale Romanum for the EF), but he passed away some years ago and his websites are no longer online; they included lots of neo-gregorian antiphons composed by him for the LotH, but also had many authentic antiphons that came in handy. And when everything else fails and you still have no music for a particular hymn or antiphon you can 1) post in this forum and ask for help, 2) try to find the antiphon in some medieval manuscript here or here (if you have patience) or 3) resort to a rubric that says that when there is no authentic music available you can choose another similar antiphon.

I have prepared two booklets for Compline and for the Office of the Dead compiling elements freely available in the Internet, so you can see that this cut and paste method works, though it takes some time to do the spade work (the current version of the booklets has typos and mistakes that I will hopefully correct in the next few weeks).

The new Antiphonale Monasticum (3 volumes) may have some of the new antiphons too.

http://www.newliturgicalmovement.org/2010/03/work-of-peter-holger-sandhofe.html

BY JEFFREY A. TUCKER
Peter Holger Sandhofe was a master typesetter of chant and the producer of many editions once distributed on nocturnale.de. That site is now down. Before it fell, MusicaSacra.com co-hosted his Kyriale. But what has happened to the rest of his music? If you know the answer, please write me. MusicaSacra.com is happy to host what remains.

Has this already happened?

What I was looking for were his fonts - the beautiful initials. It would be a shame if they were lost. I remember he was selling them for about 40 euros I think.

I have all Holger Peter Sandhofe's free PDF files with chants online here, as I wrote in the comments of that NLM's post, but not his fonts, which, as you mentioned, were not free... But see this page (in Spanish) and check if it has something you want...