Amazon has it for $7.79 with free shipping on $25+ or with Prime.
Sellout.woot! has the Barbie Dreamtopia Kiss and Care Unicorn Pet Doctor (Ages 3+) for $13 with free shipping for Amazon Prime members or $6 shipping. The unicorn horn lights up, and the set includes rainbow and pink glitter backpack, stethoscope, bottle, syringe and more.
Sellout.woot! has the 22-piece Barbie Dreamtopia Mermaid Styling Head for $11 with free shipping for Amazon Prime members or $6 shipping.