I've been scouring the internet all night trying to find a decent, balanced mod that adds fences that don't require you to be in the Thieves Guild. There's a few out there that add fences but all of them have them in overly convenient locations (some are even followers) and load them down with so much gold that it completely takes all the fun out of it.

For me the ideal mod would add maybe three new fences, each with somewhat less gold than what you would find by selling to the Thieves Guild, scattered around Skyrim. They wouldn't necessarily have to be within a city or even in a major hold. This would make being a non-guild affiliated thief viable but still make joining the guild more enticing. Even better would be a quest or two associated with each one that could increase the amount of gold they have to barter with.

Funny you should mention this. I had an idea to do something like this a while ago but then got immersed in Beyond Skyrim so put it on the backburner. I may dust the .esp off and break out the toolbox. Might take me a few weeks though. No promises...!