Well if you don't want to pay then you can get the pirated version...But I strongly suggest you pay in order to play multiplayer and actually have your own account. Or you can ask your best friend to share the account with you.
Then what kind of a best friend is he if he changes the password? If you don't want to pay then don't pay. Do it like the rest of the cheap guys and torrent the game. It's only 20$ if you're going to buy it. The price will be 50$ later when it's released so you might as well get it now.
The game can be downloaded, but a paid account is needed to play the beta.
Of course, you CAN get a pirated version, but that will only be for single player unless you get Hamachi.
There are some multiplayer servers that are specially designed for cracked versions of minecraft but it's really hard to find one. I guess you can just try it out in Single Player, it's not that bad playing alone. First time I played Minecraft for 6 months I didn't even know how to play Multiplayer.
I wanted to play multiplayer. Forget it. I don't wanna use Hamachi or play servers that are really hard to find.
What do you want us to do then? If your only option is to use hamachi and pirating it I would use that option until you can actually get the game. What do you want us to do? Buy the game for you? No thanks.