The Papa Stronsay site is one of Catholicisms best hidden gems on the Net. Now in addition to their excellent website and newspaper, they are now going to have books available online. I highly suggest subscribing to their newspaper. The Transalpine Redemptorists are a wonderful order to support.
Visit their main website here, their Pope Liberius page here, and now their bookstore here! It looks like they have a limited selection at this point, but I am sure they will have more to come. Enjoy.