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You can purchase a variety of green dog costumes from http://www.buycostumes.com/. There are many green dog costumes that you can pick for children or kids.
There are many different places to purchase costumes for kids such as the Disney Store and also on there website. Around Halloween places like Walmart, Costco or your local costume shop will have lots of costumes for sale.
party city
you can find cheap costumes for kids at wal-mart. they always have an assortment of costumes that are fairly inexpensive. another store you could try is target or kmart.
Some excellent costumes for kids this year include Disney Princesses for girls and Captain America for boys. The Angry Birds costumes are also going to be very popular.
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Information for princess costumes may be found: www.partycity.com �ۼ Halloween Costumes �ۼ Girls Costumes www.halloweenexpress.com �ۼ Kids Costumes www.costumecraze.com/Traditional-Costumes-Princess-Costumes.html
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I am unsure of what you are asking but Kids are safe at night as long as they have a parent watching them. For there costumes, They should be safe as long as the kid is safe.
I would suggest http://www.costumecauldron.com/Kids-Halloween-Costumes.html, they have many good costumes, other place are Costco or Shoppers Drug Mart.