LEGO has listed the 40289 Diagon Alley microbuild as a gift with purchase in the US from Nov 9 to Nov 21 2018 with a minimum purchase of USD99.00.
“Recreate the magic of Diagon Alley™ with this magical LEGO® micro build featuring Gringotts™ Bank, Ollivanders™ Wand Shop, Flourish and Blotts, Quality Quidditch™ Supplies and Weasleys’ Wizard Wheezes, plus a Mr. Ollivander minifigure with a wand”
We hope that this freebie reaches other regions too.