bargain price; special service price
A polite, customer-oriented term used in retail or service contexts to suggest a price set as a special favor or service to the customer.
We are offering this product at a special service price.
ご奉仕価格での販売は今週末までです。
The sale at the bargain price lasts until the end of this week.
特価 is a straightforward 'special price' without the polite, service-oriented nuance of ご奉仕価格.
奉仕価格 is the non-honorific form, less polite and more direct; ご奉仕価格 adds the honorific prefix ご for a softer, customer-friendly tone.
Compound of the honorific prefix ご (御), 奉仕 (ほうし, 'service'), and 価格 (かかく, 'price'). The term is a modern commercial expression emphasizing a price set as a service to the customer.