Free: Contests & Raffles.
And what's the difference between A2 and A3?
The reason there are so many Ruger upgrades is because they're necessary.
For a fun beater gun an AK is awfully hard to beat. You can definitely get an AK cheaper than the one you linked though, mine is one of my favorite guns to shoot, it's reasonably accurate, unstoppably reliable and it just never fails to make me smile when the handguard starts smoking! The best part is that I don't feel bad about beating on it like that!
AK-74? I know the AK-47's are cheaper. And I know there are Polish Tantal models for sale for about $350 but, I've heard some really bad things about those