Thunderfury blessed blade of the windseeker?

Aight, i played Pre-BC on warlock / druid, never got a chance to get thunderfury, after i got my lock, druid to 80 i started lvling my lvl 50 pally, he's 80 now, i was wondering what i have to do to get thunderfury, how much would it cost and would sulfuron, hand of ragnoros be cheaper / easier? thanks