I think the cheapest Halloween costumes are ones you make at home. Some really good costumes that you can make at home or with minimal budgeting would be a witch costume, a Greek god/goddess, zombie or pirate. I also recommend checking out your local thrift stores such as Salvation Army or Goodwill, because they often times have costumes used once or even new under $10.
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There are many stores that sell cheap costumes in Edmonton, Alberta. Some of these include Halloween Distributors, Custom Costumes, and The Disney Store.
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.
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.
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.
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.
There are many places that have halloween costumes on clearance. I would visit halloween stores and mass merchandisers. When visiting these sites or stores this will give you the best knowledge of what is on clearance and what is not.
You could make your own Halloween costume if you are creative. The following website offers cheap Halloween costumes: www.zoogstercostumes.com/landing/cheap.php
There are many places to get costumes for a fun tim with the family. Some places are shop.ebay.com/i.html?_nkw=family+halloween+costumes and familyfun.go.com/halloween/halloween-kids-costumes
You can find a cheap halloween costumes at stores like Walmart, target, k-mart. you can also find it online at websites like amazon.com, ebay.com, and even parycity.com which sells holloween items for a fair price with good shipping.
I think that you can find a good amount of Halloween costumes at a Walmart, or CVS, near you. They are usually there around that particular holiday. You might most likely find some at other big retail stores as well.
The dollar store might not be the place to go if you are looking for cheap Halloween costumes as complete packages. However, you might be able to find a variety of different accessories you can use in costumes there, or even assemble one from the things you can scrounge up in the store.