Pop Art is one of the popular children's craft kits among parents. The company manufactures kits for painting, finger painting, foam crafts, stick arts, and drawing projects.
There are many site you find some good craft ideas for kids. Some of them are enchanted learning, craft-kits, deviant art, organic-items and many more.
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The most important thing to look for when choosing craft kits for toddlers is that they do no include any small pieces like beads or require the use of sharp objects like scissors (at least not without adequate supervision or using scissors designed for toddlers). Kits that include paper and crayons or washable/non toxic paints are good. Kits that include glue, sticks, foam board, paper, stickers,etc are also good.
Brick and motor options for RC model kits for cars would be hobby shops or arts and craft shops. Also, more of a long shot, some department stores' toy aisles could have these.
See the links below for some craft sites.
At most craft stores, as well as big box retailers such as Walmart and Target, one can purchase a large variety of crafts that come in complete kits for both children and adults. Some options include embroidery kits, foam kits, tie dye kits, knitting kits, cross stitch kits, latch hook kits, and stuffed animal construction kits.
there should be some at local Japanese markets
There is a brand called ALEX that makes lots of affordable craft kits for kids. Some kits include materials to make paper plate bugs and others are little foam stickers that allow kids to make mosaics.
TheSlap.com, BinWeevils, Moshi Monsters and iCarly
A tradesman is some one who is good at his craft.
Many craft sets for young children can be purchased at many retail stores. Walmart and Target both carry various craft sets. Craft stores such as Michael's also have many. Some include foam stickers, paints, and other kits.
There are some good ones at minecraft forums