In Ventura County - Southern California
Ventura HD in Camarillio as far as the Retail Sales and Parts departments, list prices only, but Parts people 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, has larger inventory than most and have in store sales items and list prices only, friendly and are also very helpful, but again I cannot speak for the service done there as well.
Cycle Pro in both Oxnard and Simi Valley is very good regarding sport riding gear suitable for both metric and V-twin crowds, and their pricing of oils, lubes and chemicals is very good. The newer one in Simi Valley only 'bout 2 years old is similar, staff is not as knowledgeable but they are working hard to do well, exceptionally well stocked.
Buena Ventura Motor Sports - also caters mainly to the metric crowd, especially huge selection riding gear and accessories; but has plenty of used V-Twins and again their pricing of oils, lubes and chemicals is also very good. Regarding new tires, they are the ones who mount and balance the tires FREE if you carry in your wheel and tire, and you buy new tire from them.
Motorcycles 101 in Ventura - good selection of used bikes including Harleys at descent prices, good selection of aftermarket accessories, geared for metric street riders, with friendly staff.
Try to 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 local dealer especially if they stock part you want 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, check or debit for big ticket items).