The cost of a gift for a hair stylist can vary depending on various factors such as their level of expertise, their location, the type of service they provide, and the quality of the products they use. In general, a hair stylist may expect to receive a gift ranging from $20 to $50. However, it is always best to consult with the hair stylist directly to determine what they would appreciate and what their personal preferences are. Alternatively, you can consider giving the hair stylist a gift card or a voucher for their services so that they can choose what they want to receive.