I've found that any dealership usually isn't the best place to get a tire mounted and balanced. For me I've found a lot of places that do better and less expensive mounts and balances. I'd rather deal with the smaller guys for stuff like that. You usually get better quality work and service.
Sad, but true. Sometimes METRIC dealers will do a better job at a better price for some things especially "Generic" work like tires change and balancing (carry-in off the bike).
In Ventura County - Southern California
Ventura HD in Camarillio as far as the Retail Sales and Parts departments, list prices only, but are friendly and knowledgable. If Active military, ask for 10% discount. They are my primary source for HD parts and accessories. Have not had any service done there so cannot speak about it.
Santa Maria HD in Santa Maria as far as the Retail Sales and Parts departments, list prices only, friendly and are also very good, but again I cannot speak for the service done there as well.
Cycle Pro in both Oxnard is very good regarding sport riding gear suitable for both metric and V-twin crowds, but their pricing of oils, lubes and chemicals is very good. The newer one in Simi Valley is similar, is also good.
Buena Ventura Motor Sports - also caters mainly to the metric crowd, especially riding gear and accessories; but has plenty of used V-Twins and again their pricing of oils, lubes and chemicals is also very good. They are the ones who mount and balance the tires FREE if you carry in, and you buy from them.
Work with your retailer, negotiate prices close to what you find on the Internet (does not hurt to ask them price you expect to pay (10% off list price or 10-15% above lowest price seen on Internet...I never try to gouge them especially if they stock the part or go through the trouble of ordering it for you...just take advantage of using your credit card "Product Guarantee protection clause" (Do not pay in cash or check for big ticket items).