Has anyone bought and iphone recently?how much did u end up paying??

ok i wanna buy and iphone but i already have a contract with cyngular and i dont know how much ill end up paying…i dont know if they will charge me for a new 2 year contract…i dont know if they will charge me for leaving the old 2 year contract…
i dont know how much ill end up paying just to buy the iphone with the taxes and for the new contract and actavating it…can anyone help me????(if ur answer is good ill give u max points)