small stuff you don't really need when moving goes well. Furniture sucks...just give it away....if anybody will even take it.
I suppose one could collect stuff from yard/tag sales and resell it , or free stuff from CL.
I don't have an idea for a regular product, like something you make yourself. People want stuff really cheap....something you can get for next to nothing, not something you spend a lot of time on. Arts/ crafts type of stuff would be a failure ( IMO), you'd never get paid for your time.
I think re-selling free/ really cheap small stuff could work.