The best value I have found for an oil change is at Goodyear, and it includes the oil filter and free tire rotation.

In Cupertino, CA their normal price is $49.99 for synthetic blend oil. When you choose synthetic blend, or synthetic, they give you a free tire rotation. Not only that, sometimes they throw in a $10.00 off coupon!

Find a Goodyear near you and see if they have the coupon.