hello and welcome,
i'm new too, i was looking at a hilux 264 on ebay aswell for about $125 australian. all i know is prisms are less popular as anamorphics not sure why. i think you can do anamorphics with a prism but it is the road less traveled i did find something but it was when i first started looking and i suspect it may have something to do with the look and a prism may give you a different look compared to a ''normal'' anamorphic lens. i ended up buying two different brands of projection lens to play with neither where prisms. hopefully someone far more knowledgeable will chime in with a suitable reply.