Yours wasn't the last, though it was the last of the Regal line to carry one. Cadillacs and Buicks had them until 2005 one base DeVilles and Park Avenues, respectively. Chevrolet's Caprice had them until 1996 when the line was dumped. For Olds, you'll have to go back to the '91 Custom Cruiser and for Pontiac even further back, probably to the RWD G-body Bonnevilles (final year of '86).
Actually, the only cars with a hood ornament for sale today are the Phantom, a handful of Mercedes sedans, Jaguars, and the Lincoln Town Car.
Fact is, traditional stand-up hood ornaments don't look right on today's cars which are far sleeker and lack the ornate grille and hood decoration cars of the past had. I've seen them screwed onto some Regals and even an LS and they look awful because they're not only mounted incorrectly, but they don't fit the lines of the car.
You would have to design a fascia with one in mind, not tacked-on like aftermarket ones or that cheesy one on the Chinese Buicks, and you'd have to do it right. Jaguar manages to keep 'em classy as does Benz, but they know when and where to use them - on more formal sedans and not sportier models. I sure wouldn't look toward the Town Car for any styling ideas.