There is also less in the way of physical components in a computer wargame. There's one or more diskettes, a box and a small manual. As a result of this, the collectibles market is not developing into quite the robust creature the paper wargames market is. Largely because wargamers are such a well educated and literate lot, there are a disproportionate number of magazines serving the hobby. Most are edited and published by wargamers.
Quality is generally high.
All of these magazines can be obtained by subscription from the indicated publisher. Many of them are available in bookstores, hobby stores and toy stores that carry wargames. Similar to Strategy and Tactics. A history magazine with a game in it. For miniatures wargamers.