Jen Clothing sells beautiful and affordable modest formal dresses. The "Glamour" dress shown here is only $99.95! All their modest formal dresses are under $160, and most are under $100.
TJ Formal carries the Night Moves line of modest formal dresses. The dress you see here is $418.
Kathleen's has cute dresses for a modest formal dance. The modest formal dress in this picture is just $170
Bridal Expressions has stylish modest formals.This dress is just $399.