I would start the conversation by saying that new car prices are at an all time high and there is little availability of the best models. Also, interest rates are climbing rapidly (if financing is needed for a purchase). It is just not the right time to get into the new car market. Let’s look at it again in six months.

Of course, that argument will only work for a while.

You did not mention whether-or-not your husband is still a safe driver. If not, then a much more difficult discussion is needed about his driving.

Good luck.

What would happen if you just agreed with him? Then discuss make, model, color and then give him the price. He's apt to rethink it. Go online. Show him cars. Is his license expired? Well, he'll have to retake the test. Where I live appointments are months out!!
Moving into his world may get him off the subject temporarily without hurting his pride or having to continually deliver the "bad news."
Best wishes. Take care of yourself!