Amazon offers its Prime members the Disney Sofia The First 10" Amber Doll for $6.89 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.22.) That's the lowest total price we could find by $10. She features a full-length, glittery yellow ball gown.
Orders placed via 2-day shipping by December 22 will arrive in time for Christmas. (This option is free for Prime members but an extra $11.64 for everyone else.)