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I also place that kind of info in my signature, and at the top of my bookshelf.
Another thing I do that works well has to do with tagging. I tag all the books that are part of my 2 for 1 deal with a tag that includes my initials. (I want a tag that nobody else is likely to use.) When someone orders one of my books with that tag, I PM them, tell them to click on the book's title, then to scroll down and click on that particular tag to see the list of books they can PM me about if they want a freebee. Then I have to remember to remove the freebie from my bookshelf, and remove the tags from all books I'm mailing.