Yes sometimes there are console games ( at least where i live ) for only 5 bucks so that's quite cheap if i might say.
But i guess those are not the sales you are talking about right ?
Holy crap that's cheap. 
If they're second hand then DRM will be making that impossible in the future. Game companies suck.
It's the strange conundrum with consoles. They're cheaper to buy than a high end PC, but the games cost more. So if you're broke what do you do??
I bought a good gaming laptop, saved up for ages, and now I can buy games super super cheap and not have to save up for them. If I'd bought a console it would have been under half the price of the laptop, but then the cost of the new games would give me pause and I'd be hesitant to buy them.
Ugh.