The way Warehouse 23 works, once you buy a product, you can download it again for no cost if you lose it or if we upload a revised version of that edition. Thus, the people who bought Reference Rulebook Revision 5 were able to obtain Reference Rulebook Revision 6 for free (and to download it again when we discovered we had accidentally left out rule 4S).
Our Prime Directive books are also sold as ebooks The GURPS Prime Directive line is exclusively on Warehouse 23. Prime Directive PD20 Modern books are available on Warehouse 23 and DriveThru RPG.
We are also listing Federation Commander, Federation & Empire, and Star Fleet Battles products on Wargame Vault.
We are expanding into Kindle books through Amazon. Our first book, For the Glory of the Empire, was released there recently; more will follow.
Also in these online stores are older titles (older versions of Star Fleet Battles, some old Task Force Games titles, JagdPanther, and Star Fleet Times. You can also find our coloring books and Starmada titles.
We must note that these products are copyrighted and are not to be uploaded or passed around to your friends. Doing so is piracy, a criminal act, and may result in us deciding not to offer any more PDF products. We have already uploaded many Starmada, Star Fleet Battles, Federation & Empire, and Prime Directive products. We have created a new page that allows easy access to our PDFS for sale through the various vendors. From here you can see what we currently have posted and have links to those products.
So check them out! Many people like the fact they can search our rulebooks for a keyword and find everything that pertains to that issue. Others like the fact they can carry around multiple books on one device. Some ship cards are available exclusively as PDFs. Whatever your reason for using them, we hope that you enjoy them and rate them.