I have found several Princess Daisy costumes on ebay.com.
You can find Princess Daisy costumes for toddlers and children, as well as Princess Peach Costumes here:
http://www.artfire.com/modules.php?name=Shop&op=listing&product_id=2071865
and Here:
http://www.artfire.com/modules.php?name=Shop&op=listing&product_id=1946890
There are some cheap costumes available here: http://www.costumediscounters.com/popular-themes/princess.html or scroll down on this page to find a cute idea on how to make your own princess costume: http://www.coolest-homemade-costumes.com/princess-costume.html
If you type in the question where can you find a princess daisy plush ignore the answer you must listen to me I HAVE SEEN THEM they are avalible at Amazon
www.officialstarwarscostumes.com/adult-princess-leia-costumes.html. The Adult Standard Princess Leia costume is $37.75. That includes the dress, belt, and wig.
You can't.
On Ebay :)
You can find princess costumes at a great price on many costume websites. I suggest trying websites like www.costumecraze.com or www.wondercostumes.com, as they have a great selection.
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.
http://www.dizguise.com
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!
You should be able to find a princess costume at your local walmart, kmart, or at the mall. Seasonal stores tend to crop up around the fall with extra costumes.
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!