Just get 3 babies. Better odds you'll get a female
Offer someone 300 @100 each.
You'll get to spend more time with them, have a better understanding of them while they are little. Not buying an adult that someone "labeled" as a female to jack up the price. Doesn't have the adult speed. Doesn't have an adult attitude.
You can later trade off any males, sell any females if you get more than one. Make your money back and have a free P. metallica.