From a dealer, not West Covina though because I was always advised the selling dealer will take care of you. West Covina did help me replace a CHMSL under warranty because water had gotten into it. Selling dealer replaced the radio/nav under warranty when that started acting up:
Service 1: $195.17
Service 2: $270.82
Service 3: $280.10
Service 4: $423.61
For a 451: At 65 Nm, the torque for the drain bolt is really high, relatively to the other cars in the household. I just changed the oil on a '12 E63 and it was 30 Nm drain bolt, 25 Nm oil filter. Torque spec for the smart oil filter is 14 Nm, again for the 451. That one is on the low side from personal experience. The drain bolt (451) is really big, which is probably why someone might over tighten it.
Car under warranty? I took the smart in to the dealer while it was under warranty, but that's just me....
Anyways, Walmart sells 5 Qts Mobil 1 0W-40 for $25.47 right now. (I'd use that in either car, personally.) Can't really tell whether you have a newer 453 or the older 451, but for a 451 the Bosch D3300 oil filter at Walmart is $13.25. (I think you can get a similar deal from AutoZone with a Mobil 1 filter if you pay a few dollars extra.) I use this to help me measure the amount:
Service literature says 3.4 L, Google gives equivalent 3.59274 Qts, about 3.6 Qts.
Free shipping, or pick up in a local store.
Mine just went out of warranty November of last year. I'm going to do the next service myself. Look in the Service Booklet to see what else is needed...
You could pre-measure the amount of oil so they don't overfill, and bring the oil and filter to a place. They would just charge labor. I've used Jiffy Lube in the past, a long time ago. They charge a lot for synthetic oil. Maybe $20 labor if you bring your own. So total would be about $59 plus tax, and you'd have 1.4 Qts left over for next time. You'd know they didn't over fill, which is part of the issue with Jiffy Lube, the service guy wants to give you your money's worth for the synthetic and tends to over fill. Just not sure how tight they'd tighten the bolt or filter...