K.J.
You can find some great Plus Size dresses for a decent price from Macys.com
http://www1.macys.com/shop/plus-sizes/plus-size-apparel/p...
Also try LaneBryant.com
I LOVE this one ... http://www.lanebryant.com/plus-size-dresses-skirts/view-a...
Even Target has some good things... http://www.target.com/Plus-Size-Dresses-Clothing-Womens/b...
Good luck!