As a member of the Black Briars Guild for nearly 2 years now, I can say it is one of the best trade guilds out there. There's no dues, no pressure to meet sales quotas, lots of fun raffles, auctions and other group events. I've made tens of millions trading with this guild. Member spots don't come up often, so join when you can.
"We have found a cave, but I don't think there are warm fires and friendly faces inside."