The only options that I can find for points is the TownPlace Suites in Mt Laurel, NJ. I have driven from Mt Laurel to Atlantic city about 10 years ago and I think it was about a 40 minute drive. This hotel is a category 1 so a "normal" stay would be 7,500 points and if they have Point Saver deal going it would be 6,000 points. Good luck!
I did see a Fairfield Inn in Atlantic City offering a $79 rate. Neither of these properties would be considered a "motel" as they offer more and would typically be more upscale.