A <i>far</i> better source for SF periodicals, and <i>much</i> more besides: <a href="http://www.luminist.org/archives/SF/" rel="nofollow">http://www.luminist.org/archives/SF/</a><p>I donated! I occasionally came across some broken links, but they were fixed in due course. This site is one of the treasures of the Internet.
There's also archives of New Worlds and Amazing Stories (and no doubt much more) on archive.org. If you like older SF, worth a look. Modern and contemporary SF often just re-treads, only worse, some great stories from the past.<p><a href="https://archive.org/details/newworldssf" rel="nofollow">https://archive.org/details/newworldssf</a><p><a href="https://archive.org/details/amazingstoriesmagazine" rel="nofollow">https://archive.org/details/amazingstoriesmagazine</a>