How does it work with the books and promotional items?
(Do I buy one book to get one promotional item, or does the book contain a way to order the item, or ... ?)

Which promotional items can still be acquired, and which ones are unavailable?

Thanks for answering.

You get the book, there is a coupon in the book, you send the coupon to FFG, they send you back the promo item.

I think they are all available, but you can mail FFG customer service to know for sure

You need an additional 2 US dollars for postage, for each card in my case although you might work out a joint deal with FFG if you try. I only got them because I had exactly 4$ left from when I lived in northern California. Now, they asked for a cheque or postal order, but I just bribed them with hard cash.

Or try this link: http://www.boardgamegeek.com/filepage/71859/promotional-content

By the way, you may get lucky, too, as I did, if you mail in a single coupon.

I don't know how or why this happened but a year or so back I sent in the coupon for the Oliver Grayson ally card and, a few weeks later, received it plus the Dance of the Damned promo Mythos card, an Elder Sign promo adventure card (Log of the Persephone, I think it was) and three promo cards for Android!

Definitely an unexpected and welcome surprise.

This doesn't apply for Kindle books though! ^^;