What is the amount and cost of a lethal dose of ecstasy and methamphetamine?

I know it depends on body weight and all; the character is an average height female, slim build. No tolerance.
I'm not suicidal, I'm writing a book.

: http://alcoholdrugstreatment.info/what-is-the-amount-and-cost-of-a-lethal-dose-of-ecstasy-and-methamphetamine