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.
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.
http://www.buystarwarscostumes.com/ This website has a lot of Star Wars costumes for cheap for kids and toddlers as well as full size adult costumes. You can also find some at amazon or Halloween stores like Spirit Halloween.
Theres $15.00 at party city for kids or $24.99 for teens the cheap mad hatter costumes are at party city
The best way to find cheap Halloween costumes is ebay.com. You can also try thredup.com. With thredup you just pay the cost of shipping and can get a medium box of items for free. Your local Target or Walmart is a good source for good, cheap costumes.
People can find cheap, girl costumes. Going to Party City, www.ebay.com, www.amazon.com, and www.costumediscounters.com/girls-costumes.html are all good options.
www.winning costumes.com
Police officer costumes for adults and kids are very popular and it makes them easier to find. Check out these websites for a variety: http://www.buy-cheaphalloweencostumes.com/police-costume-for-kids/ and http://policemancostumes.com/kids-policeman-costumes.php.
To find Halloween costumes, you may want to go to Target or Walmart. Their stores usually sell cheap costumes and they usually go on sale and have coupons. You can also make pumpkins or sucker ghost crafts.
I always check toysrus.com because they show some master chief {halo 3 editon} costumes but i can't say that those things are cheap.
Army/Navy Store.
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"Value Village" is a good shop with cheap,and stylish costumes. Although the most of the costumes are second hand, all of them are in good condition and set at a cheap price.