I live-chatted with a representative and asked her, "Do you still make any heating pads without the auto-off feature?" and she replied, "All of our heating pads have been upgraded to auto-off."
Don't know if everyone knows this already, but I just talked to Sunbeam today and the lady said they have upgraded all of their heating pads to auto-off. I trolled eBay just now and put a bid on one (please don't snipe me! lol) and bought another outright hoping they're old enough to stay on...