D.W.
Please keep in mind if you are looking for a custom cake you will pay a higher price than something along the lines of the local grocery stores or Sams club.
I am a decorator and am friends with many folks who do custom work and their biggest frustration is a client who wants custom work but wants to pay grocery store prices. A custom cake artist can't and shouldn't compete with those prices. It's apples to oranges. And when you start sending pics and going back and forth over design ideas that cost the artist time and therefore money.
Just wanted to toss that out so you don't have sticker shock. Happy birthday to your girls!