I found a niche on eBay, I sell a few specific items and use eBay as a funnel for my own store. Sure, I have to make a few trips to the post office a week, but it's a steady $1k per month or so. If I knew anything about online marketing I could increase my volume, just haven't gotten around to it yet.

Ideally I'd like to buy some rental real-estate, I'm just not too into the risk profile of that kind of thing for now.

My only advice here is to be careful of the brand / market you go for - DTC is great, however handling customer support is a huge drain.