Price Check Replace blown head gasket on my Craftmans sel 6.75HP Briggs and Startoon engine

How much will it cost me to have Sears replace the gasket on my Craftsmen self propelled 6.75 Briggs and Stratton self propelled lawn mower? Most of the new mowers that I checked have issues and my mower is 14 years old and stats on the first pull

Price Check Replace blown head gasket on my Craftmans sel 6.75HP Briggs and Startoon engine