The only fullback who is really of that standard and off contract is Kevin Locke. I'd rather we persisted with Mead and Roberts though tbh. Plus I could imagine the Raiders and Bulldogs will throw huge money at him after the Broncs stole both their fullbacks haha
Halves- List for 2015 availability is very weak. Off contract end of 2015 however has the likes of DCE, A. Reynolds, Hodko, Foran and Maloney. Sezer is also off contract end of 2015.
Hooker's available off contract end of 2014 are not many..end of 2015 however there is Isaac Luke and Jake Friend as well.
Glen Stewart is listed under the "lock" category on Zerotackle as well.
A few people here have mentioned Loko; he isn't available until 2015 either. Bearing in mind he turned down a 500k/season offer with the warriors last year in order to stay closer to his family, I'm not sure he'd be the easiest player to pick up