Here are some of the MySpace/hi5 clone scripts

This one is free. It is not a myspcace clone, but has some such features:
URL: http://www.boonex.com/products/dolphin

Here are some from DeccanBazaar
DeccanBazaar Community Php Script(Myspace Like)
Price: $ 60.00
http://www.deccanbazaar.biz/view_item.php?ItemID=464&CategoryID=6&SubcategoryID=99

Hi5 Clone Php Script (I think its currently under construction)
Price: $ 99.00
http://www.deccanbazaar.biz/view_item.php?ItemID=465&CategoryID=6&SubcategoryID=99



There is also this one, but for $280.00 .
I have heard good things about this one though. More like phpfox I guess?
URL: http://www.alstrasoft.com/efriends.htm

And here's another one
URL: http://www.2coolcode.com/ourspace
$150.00

I haven't checked all of them yet. I have downloaded the free one and I'll test them on my server soon. Feel free to check them out and comment here...
I have found too many MySpace clones out on the internet. If you are planning to buy one, be careful and check whether you're paying to the rightful script owner :)