You can find the craft ideas at either Hobby Lobby or Micheal's. They have specialty crafts at both of these places. They also offer craft classes all year around.
You can find cheap monster craft ideas from books and magazines. You can also ask friends and family for ideas. Kids will have lots of fun no matter what, so don't be too stressed about it.
You can find plans and materials at any craft shop such as a Micheal's.
There are several good sites to find monster craft projects. You can try http://crafts.kaboose.com/sandwich-box-monster.html, http://ediblecrafts.craftgossip.com/monster-party/2011/04/07/ or even http://www.activityvillage.co.uk/kids_crafts.htm
Hobbey craft has a wide range of craft materials, but you can also find a range in large supermarkets. However why not start saving back empty cereal boxes, yoghurt pots, kitchen paper rolls etc so you have a large stash of craft supplies for the summer holidays without it costing anything!
There are many places where one can find monster stickers for boys. Craft stores such as Hobby Lobby stock a wide array of stickers. These items can also be purchased at mass retailers such as Target, Walmart, and ShopKo.
You can find step by step instructions on creating monster bags and other crafts at http://www.craftster.org/forum/index.php?action=tags;sa=showtopics;tag=monster. You can also find a kit at http://www.orientaltrading.com/foam-monster-trick-or-treat-bags-craft-kit-a2-48_4664.fltr
Household materials may be classified as toxic and nontoxic. Bleach and ammonia are toxic while vinegar is not a harmful substance.
Try craft stores like Michaels and the craft sections of big box retailers like Wal Mart and Target and you should find different types of feathers for sale. Online, peacock feathers can be bought on amazon.com and ebay.com.
One can find good sources for card crafts from: Hobby Craft, Card Craft Plus, Craft Superstore, Card Craft UK Store, JGD Craft, Craft Work Card, Crafts Beautiful, Handy Hippo.
Press square then monster.
If you are looking for materials on the internet a great website would be http://www.enasco.com/science/. It offers any kind of science project materials. Checking out your local arts and craft store would also be beneficial if you're on a time limit.
An excellent place to find ideas for holiday centerpieces is on Youtube. There are a lot of videos explaining how to craft these things yourself, how to arrange them, and what materials you'll need.