If you are looking at the new Ram 1500 (5th gen), then I have yet to see one that does not have push button start. Even Tradesman models have it now from what I've seen. I'm not sure about 4th gens, if you're wanting to look at those, including the 2019 and 2020 1500 classic. But I think it was an option for the Big Horn, and standard on any model above that. Pretty sure anything below a Big Horn didn't have the option for it. Bottom line though, if you want a base model with push button start, look at the 5th gens.

 

I don't believe you will the cab with a push button start on one that is a few years old. You won't find a new the cab as they have been discontinued.

 

I don't think they make the 5th Gen in regular cab at all and the new Classics with reg cab don't offer it.
But I saw some 2104-2018s for sale with it, but not in a color or location I want. These were Sport or R/T models. But then I would come across a sweet one in my area at a fair price and as I look through pictures, I see a key hanging out of the dash. So I was just wondering if there was a "tech" package or "convenience" package to looks for?

 

Sorry, I missed the part about you wanting a regular cab. My reading comprehension is pretty low when I first wake up.