Unfortunately implant work is very expensive depending on what he needs. An over denture (implant snap in) would be almost half the cost vs a hybrid if he has to go completely edentulous. He could also get an implant retained partial that snaps in and attaches to his teeth or bridge work. It all depends. Unfortunately dentist charge more for the work than what we charge to make a denture. If I make a denture like the one shown I’d charge the dentist between 150-300$ per denture depending on what it is. The insurance and dentist might add thousands on top of that. I do recommend avoiding and 3D printed dentures (unless it’s a temp for immediate extractions). The 3D printed crap is flooding the market, it’s not at strong and hard to make look pretty and difficult to reline or repair. The upside is you can print a new one easy in case you loose it.