There are actually a lot of plus size stores around nowadays, you can find them at most malls or shopping centers. How much the clothes cost will vary from store to store. Here's a website link to a plus sized store that has good prices on a variety of dresses. http://www.avenue.com/
You can find plus sized dresses at big department stores websites such as JC Penny, Macy's Women, Sears, Kohls, Designer Warehouse, and other sites as well.
Lane Bryant.
Macys.com has a large selection of plus sized dresses. Many are also at a very affordable price for those looking for cheaper dresses.
For plus sized beach dresses, visit http://www.alwaysforme.com/coverups2.html. They offer matching cover-ups and sun dresses for your swim wear to complete your outfit for the trip to the beach.
Places like Overstock, Forever 21, Torrid, and Nordstrom not only offer plus size options in terms of dresses for plus sized women, but they also offer leopard print dresses in plus sized sizes.
Sydney's Closet (http://sydneyscloset.com) and The Rose Dress (http://www.therosedress.com) sells plus-sized formal dresses.
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You can find plus sized dresses for a child by going to Jeeny Beans, Sears, Bonnie Jeans, and Old Navy, Gap, and Elegant Plus. You can shop on amazon.com.
There are a lot of places in order for one to find out the best bride dresses. However, it is strongly suggested that one should check out from the website Wedding beforehand.
For plus sized wedding dresses in New York, you can try Kleinfeld or even Lane Bryant. You can also try The Bridal Building or Bridal Suite of Manhattan.
There are several online stores/catalogues for plus sized dresses of various styles for various occasions. Try evogues.com, plussizethis.com, elegantplus.com, amazon.com, overstock.com.
Thrift stores like Goodwill or Salvation Army are the best place to find inexpensive dresses that won't be worn very often. You need to check them often in order to find what you want at the best price.