**Coupon Expiration Updated to May 31**
Firestone is offering a full synthetic oil change (up to 5 quarts full synthetic Kendal GT-1, oil filter) and 4-tire rotation with air pressure check/refill for $39.99 through May 31. If your car doesn't take full synthetic, you can also get $10 off a synthetic blend or high mileage oil change and the tire rotation and air pressure check/refill is still included.
Coupon is at the below URL. I think you can make an appointment online too.
This is the best deal I've found for full synthetic. I used to pay $65 at my local shop for the full synthetic oil change alone (everyone else wanted well over $70). I've called my local Firestone and verified this is legitimate and will be taking the car in later today.