When you look at the places I mention it goes beyond badges.
The only problems would be personnel and website maintenance, everything else should be easy. Why a courier, use the post office. People set up their own businesses from no more than the kitchen table. I know of a mother and daughter who do handmade greetings cards online and at local markets. Go into the post office at the wrong time between Sep and Dec, Jan to March and June and be prepared for a wait, while they are putting their orders through the Post Office. When I’ve spoken to them, they send things 2 or 3 times a week, unless someone specifically requests it sooner, but it attracts a premier price.
The biggest problem would be willingness. I wonder how those I mention cover their costs etc and are they businesses in their own right?
It seems that the biggest gripes are quality and cost, doing it yourself allows for QC and keep the price competitive.