you can always install it manually although i can't help you with that as i've never been able to do so successfully. i've always relied on one of the jailbreak methods to put it on there for me.
or you can try jailbreaking yourself with one of the methods, i like iPlus or Pwnage. if you're living in the states, i recommend buying one either from apple or at&t and jailbreak it yourself. it is not worth the extra money