3D scans for twins...

William
Has anyone got 3D scans for their twin babies? We are 26 weeks preggo and weighing up the cost vs the liklihood of whether or not the sonographer will get a good picture of both of the twins. We been to at least two ultrasounds where we could only get a side view or no view of one of the babies faces. Any thoughts or successful 3D scans for twins?