Dealsaholic via eBay offers this Scalp Massage Brush 5-Pack for $5.39 with free shipping. That's $1.09 per brush and $3 under the lowest total price we could find for this quantity of a similar brush elsewhere, outside of the mention below. It ships in assorted colors.
A close price: MoGo Products via Amazon offers it for $5.99 with free shipping via Prime.
Brand: Ocean Pure