Ray: They are scarcer than hen's teeth. I sometimes get them by way of a friend inthe States (Now two friends). I am expecting to get some soon. I will PM you asap when they arrive.
Supermercado National has a pretty large bookstore inside the supermarket, and I have found various books in ENglish there. No idea about magazines however.
FWIW, in the capital there is a newspaper and magazine shop called Macal? on Nouel casi esq. Meri?o in the Colonial Zone - near the Cathedral. They stock Time, Newsweek, Economist and many other international titles.
You can set up an EPS account and have your regular subscriptions sent here. A little costly but not much more than the high price put on any english mags I have bought at local stores. Definately worth it for those hard to find mags like golf digest etc..Tom