That depends. Are we talking next gen consoles strictly, or are we talking any console from any generation? If it's next gen, then it depends on all its capabilities. Is it reverse compatible? How far? Is it DVD/Blu-ray/4K DVD? What are the specs? Will a rerelease have more capabilities (think Xbox One X)? Are there any add-ons that I would have to buy?
Previous generations, it depends on what comes with it. How many games, controllers, cables, memory, etc. If it's a cartridge system, say SNES, is it the first series or second series? Is it complete in box, or just a loose console?
It really varies on SO much.