The Deep Meditation book has also just been published in Spanish and can be found on the books page of the new website. It is available in paperback and ebook formats.
The plan is to continue translating the online lessons and books into Spanish until they are all done. It will take a while, but we'll get there.
For more detail on Spanish translations, and on the increased visibility of all international translations on the main AYP website, see this recent forum post.