You must pay full price in order to get the phone without having to obligate yourself to a new contract. That said, the contract is not for the phone, it's for the new line you add. So if you wanted to replace your wife's and daughters LG's with a DINC, then purchase them full price, log into verizonwireless.com, select 'account' at the top of the screen, make sure you are viewing 'account overview'. To the right of your DINC you will see "I Want To...", below that chose 'activate phone'. Follow the directions to activate each phone.... and your done.
You will incur no activation fee's and will not add a new line to the current family plan. Hope this helps.
Lator