1. The middle man car seller
Lets say your on local classifieds and you see a car for sale for $7k but you know the real value of the car - which is $12k when you take the amount of km and everything into account.
You contact auto private seller or dealer and offer to sell the car for for them. You post a better ad with details and better photos and post it for $12k...which would mean you would pocket 5k and the Original Seller gets 7k.
Now I was trying to figure out how you would would communicate with the seller your part of the commission...
The buyer will obviously contact you via ad and would like to see the car. Now would you go t to the seller and tell him the buyer is on his way, then the buyer comes with 12k in hand, would the original buyer get mad if you took 5k commission? or would you make an agreement that if you sell the car for them you're entitled to a certain percentage of each sale?
Either way it seems like a decent concept if your a good copy writer for ads and can actually sell.
2. The booklet flyer guy
My second idea is contacting companies (like your local pizza store, or cable companies), and offering to put an ad for them in your own designed monthly ad flyer booklet with multiple pages of ad's based on one or two specific niches, if you don't design yourself you can hire someone from fiverr to make the ad's and hit your local printing centre to get the flyers booklets printed, then you would mail them out on a certain route every morning
its a bit more effort, but if companies are paying you 500$ - 5000$ each per month, you can turn it into a full time service.
If anyone wants to chip in these concepts feel free. I was thinking about doing the first one on the side but we'll see