The websites Uproxx, Glamour, Petticoat Lane and Haunted in Hillsboro have multiple pages and lists dedicated to costume ideas for those who are on a budget.
If you want a cheap, used Minnie Mouse costume, I would suggest Ebay. Amazon.com and a local costume store are not bad ideas to check out as well. Good luck!
You can't.
On Ebay :)
newyork, all costume leap cheap that sore 15th steet
A cheap Batwoman costume can be found on eBay or on Amazon. They can also be hired cheaply if it for a one off party from many stores that do costume hire such as fancydress.
You can make a cheap mascot costume using foam, leaving holes for the eyes, mouth, and nose. You can also make them out of plenty of fabric for a more defined look.
If you are looking for unique costume ideas, you can find them at http://www.essortment.com/halloween-costume-ideas-50-unique-weird-ideas-52253.html. You can also find unique decorating ideas at http://www.halloween-website.com/decorating.htm
Pumas Cougars Cubs Fire ants Bulls Walruses Tigers Lions Jaguars Falcons Eagles Vikings Bulldogs
http://www.dizguise.com
If you want costume ideas then the best place for that would be online on some Halloween websites. You can also just go to a website that has Audrey Hepburn costume ideas on their as well.
There is a whole website devoted to flapper costumes. You should check it out here http://www.flappercostumes.com/. You can get tons of ideas for your own costume by studying their's.
Cosplaytrader.com is a good start! Alright you can make a costume or go to the good will and find a nice costume or you can find some clothes that would go with you costume a kid i know did that and went as a pirate!