To buy WoW Classic Gold from online store, safety is always the first you should think about. If it is really hard for you to farm WoW Classic Gold, you can buy it online. But you must choose a trustworthy site. For my own experience, https://www.zzwow.com/wow-classic-gold is a very good site because I had no problem with the transactions during the past years. If you are worried about the risks, I'd like to tell you the site is 100% safe.