I know that RSorder has been selling cheap and legal RS Gold because I have been buying it there. Based on my multiple purchase experience, I think RSorder is a good website for selling RS3 gold.
Their prices are the cheapest. When I place an order, I can get a coupon code from their live chat service, which helps me save money at checkout. Their customer service attitude is very good, and I am very grateful to them. Don't worry about security issues, they are very professional and 100% legal. I have used it many times without any problems. This is my answer, I hope I can help you.