I have made several purchases from RCMart directly, as well as from their eBay store Dinball an they are excellent to deal with. My items take about two weeks to arrive and require a signature, but I have never had to pay taxes or duty. Some items include free shipping and they often have...
You might add http://www.rcmart.com/ to the list. Also known as Dinball on eBay.
I have shopped at RC Mushroom and they are OK to deal with, but sometimes a bit higher on price.