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How big is your boy?
The mosin is a long, heavy weapon with a pretty good kick(but not unmanageable).
While the mosin is cheaper, up front, than an sks I think that the sks may be the better option for your boy if he wants something he can shoot all day.
The mosin ammo is a little more expensive than your bargain 7.62x39 stuff.
The mosins bolt can also be a pain to cycle without the help of a 2x4 plank.
I don't have an sks and have never shot one but it is on my short list.

I know it looks like I've been doggin on the mosin a bit but I'll tell ya....I love mine!
Its a blast to shoot and is probably capable of taking out any north american game. Just get a recoil pad to add to the stock to take out some of the "thump"....they normally can be had for about 15.00.

Mine was also accurate out of the box. I hit a beer bottle with iron sights, unsupported on my 3rd shot at about 40 yards.
Oh yeah, its also kinda loud.

If you can find one for 100.00 there is NO REASON you SHOULDN'T take it home with you!
If there is a gun show coming up in your area I would look there. There are always plenty to go around at most gun shows and they will normally run you about the 100.00.