We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Creating Coupon code for customers?
I don't know if this is the proper place to ask, but here goes! I would like to offer my existing customers from my mailing list a discount on the printed version of our book (I sell the PDFs directly through my site for a time before making them available anywhere else for sale). I do not wish to discount the book for everyone who comes to Lulu. Is there a way for me to create a coupon that is good only for my books?