Here are some good places to start:
www.cruisercustomizing.com -- you can sort by bike which means you will only see the accessories that are supposed to fit on your bike; they also have product reviews posted by purchasers which is a nice feature
www.bikebandit.com -- haven't bought from them but have heard they are good if you know what you want
www.motorcycleproshop.com -- good prices; I have bought from them and been satisfied
www.classiccruiser.com -- good prices; I have bought from them and been satisfied
www.newenough.com -- this is a great place to buy gear (like mesh jackets). They carry last year's inventory -- new items that didn't sell; usually at really good prices; they have more inventory for men than women
ebay also works if you know what you want