I am a serious doll collector and want a number one blonde ponytail barbie doll!?

im a serious doll collector and have mostly barbies. i have been into dolls forever i went through the american girl thing and ended up with 17.....no im not rich i got me first one when i was like 5 and that was10 years ago so from christmas and graduations ext they added up. and now im older and my special bday is comming and i want a number one blonde ponytail barbie not a repro. any suggestions as to how i can actually do this?remember these dolls can cost 15,ooo dollars!?