With the Darlin' Dinos I would say about $5 to $7 each, but I don't know the exact pricing on those individuals. Darlin' Dinos rarely pop up on Ebay so it's hard to price them. (And by the way, if you plan to sell them I might be interested).
Oh wait, hold that thought -- there are a whole bunch of them on Ebay right now, but they're almost all MOC! I stand by $5-$7 for the nice condition that yours are in (there are some in a bit worse condition for about $2 or $3 in completed listings, but they don't even appear to have sold).