I believe Model Die Casting offered a 4-4-2 Atlantic years ago. I've done a little searching on the web, but have been unable to locate one.
The Roundhouse kit is a Harriman Atlantic. Not correct for a Pennsylvania RR model. Wrong firebox, wrong tender. I’m assuming the OP is wanting a prototypically correct model. There’s nothing wrong with stand ins. I still use them myself in a pinch!
E7s are not that common but E6s are every where. Most people want E6s because 460 is an E6 .
The MDC has the correct boiler (belpaire) and tender. MDC produced both a Harriman and a Pennsy, detail wise it is based on 460 .
I have one that I got in January , $45 kit. The MDCs show up from time to time on ebay.
, Bowsers are common as dirt....here have 5
https://www.ebay.com/itm/Bowser-PRR...707486?hash=item2175d35f1e:g:SxcAAOSwIftfS-81
and Bowser still has stock on parts .
I think Mantua may have produced one as well.
If one were to be produced by BLI it would cost as much or more than a good used brass , I suspect the price point would be $400-$500 list.
The cheapest best is going to be a Gem / Westside or a (newer) Sunset , You should be able to get one for >$200. You just have to be careful about what you buy and how much you pay.
Brass is the least expensive way to go on steam , I have purchased 7 this year and have yet to pay over $200 , 2 were thru dealers (
Brasstrains.com and
alleghenyscale.com ) and some have never been run. Articulated and Duplex run another $100. Key and Challenger are expensive.
And I would rather have brass than BLI .