SoftWalk Rocklin Bootie

Price Range: $ – $$

At Zappos.com:
Rating: 4 out of 5 stars – 792 ratings
Includes many 5 star reviews from narrow buyers.
Also includes several reviews from narrow buyers who said the narrow width was not narrow enough; a couple reviews that said the narrow width was too narrow; and a review that said the heel cup felt flat against heel, and rubbed the heel.
View shoe on Zappos site

At Nordstrom:
Rating: 4.2 out of 5 stars – 78 ratings
Includes a few 5 star reviews from narrow buyers.
Also includes several reviews from narrow buyers who said their heels slipped in the boot. Most of those reviewers used thick socks or extra padding to keep the heels from slipping.
View shoe on Nordstrom site