yeah man its easy just be sure its a well trusted site, I buy 10-15m at a time and i always get it and sometimes they will give you Codes to earn extra GP, you wont get banned, just as long as you don't, 1. say you purchased, after you add them and get your gold Delete the person, and be sure to set your chats as all hidden, and dont go on a huge spending spree. If you'd like the website i use just PM me and ill send you the link.

Player Auction is the place to go. But I'm not to keen on recommending to buy gold as it kinda strips to whole idea of the game away. But as always I wish you best of luck.