What console is the perfect blend of ease, cost, and demand?

[Horrible N00B]

I have Summer break from school around the corner, and I'm thinking "Why not learn, get a hobby, and make money?" So I want good consoles for easy portablizing and cash, and need a recommendation or two. I also have limited cash, so I want it to be very cheap, but profitable. I want to make maybe 25-50 dollars on each, 'cause I don't believe in overcharging.

 

[Kickback]

Re: What console is the perfect blend of ease, cost, and dem

Look into NES on a chip clone systems, they are small and usually very cheap.

Or maybe PSone?