You can find a dragon costume for a child at Target. If you would like more options, please the following website: www.nextag.com/child-dragon-costume/products-html
BiG bird
Walmart does indeed carry a childrens spider costume. In fact it is one of their most popular models and frequently sells out early so if you want one make sure you buy it early.
You can find cheap Halloween childrens costumes by going to Spirit Halloween or going online to amazon or other Halloween costume sites online. Spirit Halloween is what I'd reccomend because it's cheap,good quality, and they have costumes for kids like bees, princesses, pirates, etc.
You could find an Indian costume at www.partycity.com, under the costume section. In addition, you could also find an indian costume at www.buycostumes.com.
You can find a lion costume that is not a characterized lion costume at partycity or costume express or a halloween store located in your area
If you are looking for more information on what is the list for a costume boys will put on come Halloween, the best place to look is on halloweenedge.com/category/childrens-costumes/
Possibly the Indian chief character ( Thundercloud?) from Howdy Doody.
One can find a cheerleader costume at Costume Supercenter. However one can also find a cheerleader costume at many other places, such as Amazon, Wonder Costumes, or eBay.
walmart
You can find a good hippie costume at costume express. They carry a bunch of different costumes and they are just a costume store so they would be the best place to look for your hippie costume.
You can find a coke costume for Halloween at costume stores, online retailers like Amazon or Party City, or by searching for costume rental shops in your area.
you can find a mew mew power costume on ebay.