Kids Magazine Writers website at http://www.kidmagwriters.com saved me lots of postage money and heartache. Under Market Info/Editor Speaks you will find the article "Going, Going, Gone. Provided is a list of magazines that have folded. Several were on my new list to send manuscripts to. This a great website for magazine guidelines for submissions and a whole lots more. If you have any information or an article to submit to their website it will help them keep supplying information we need and it provides you with another or your first published credit.
Hopefully some of these magazines will return and new ones will pop-up.