2 part answer:
on paper, the raise was $4, but it was actually $3 due to losing a shift differential. However, after a first review 5 months in, that went up to a $5 raise, 4 when considering a shift diff.
but like everyone says, all stores are not the same. Having a degree impacts how you can negotiate, as well as your time with the company (the longer you've been with the company the smaller your promotional raise is).
Also, all positions are not the same. The smallest raise I saw someone get was when they moved from a human resources member to a starbucks team lead: $1.05/hr. The biggest change for her was getting a guaranteed 40 hours a week. Plus you accrue vacation faster.