Need help with marie antoinette costume!!!!!!?

Need help with marie antoinette costume!!!!!!?
doing a salon in ap euro. need costume by wed.
doesnt have to be marie.. but i need a dress of a woman in the 1700s.
any ideas?
i dont want to spend too much money.. so no costume over 30
and it has to be somewhat okay and pretty
and not from some vintage shops or goodwill.

Get this reality: Halloween's over