I feel bad for saying this but you probably aren't going to find an Angelique costume, and if you can't find one it will probably be a collector's piece and not for a reasonable price.
A Carrie costume isn't hard to pull off, you just need a dress you don't mind ruining and 1-2 quarts of fake blood. You will want to test out different brands, or make the blood yourself to see which ones stain the skin and hair. You don't want to have to explain fake blood stains on your hair, face and arms for a week or two!
There are so few female horror characters that are the bad guy (not just a dame in distress) but a few I can think of are the Freddy's mom and the crazy chick from Misery.
I wish you luck in finding your costume!