Sanbernardino sales tax V riverside counties sales tax?

so bought a computer a week ago and im going to go return it for an exchange...so i need to no the sales tax of Rancho Cucamonga-sanbernardino county im currently in corona- Riverside county...so i need to no if the sales tax is the same for both cities that are different counties.i think the last time i checked it was like 8.75..for both counties and cities