I'm satisfied customer of Ham Radio Outlet, DX Engineering, West Mountain Radio, Quicksilver Radio, Morseexpress.com, and qrpkits.com. I've also bought factory direct from Elecraft, American Morse Equipment, Begali, and hobbypcb.com.
I haven't had a problem with any of them.
The ham community is small enough and gossipy enough that nobody could be outright fraudulent and build a significant long-lasting business. Most places have well-deserved good reputations for customer service. There may be individuals and very small sellers on the used market or on eBay who don't follow the best ethics and/or don't pay enough attention to prompt customer service, but the major players are generally pretty good.