the cheapest and maybe most under rated knife for this task is a simple razor blade, they can be had dirt cheap and are as sharp as they come!
you can step up for a few extra bucks to a GOOD razor blade utility like knife, with a retractable blade set up! then they will also carry extra blade in it in a safe way!
and if your NOT one that is good at sharpening a knife, this is a very reasonable way to go! as fast and easy to swap blades out as needed! and the
replacement b lades are cheap and sold all over!
the newer generations of utility knifes are much better designed, and user friendly, many have better rubber textured grips to help when wet or bloody!
But to be honest, all anyone needs to field dress a deer is a simple sharp knife, they don;'t need to be fancy or costly
and there are no shortage of options, from cheap to as costly as you wish to go!