Hi JimPanse,
to the forum!
I'd never heard of a Philodendron cultivar 'Caramel Marble' so I did a google search and it sure is a beautiful cultivar, hopefully the variegation remains stable! I found one site that says it's the most sought after Philo. in the world and WOW is it ever pricey! $$$$$$$ It's selling on different etsy sites with prices from $400 to almost $9,500!!!
Your might want to change your profile to show what part of the world you are located. We have members here from all around the globe and it's helpful for those trading and selling plants, to have an idea of what might be required for shipping to your location. Be aware also that when trading or selling plant material internationally, there will likely be import/export certification forms and costly phytosanitary certificates required.
Good luck in your search for that beauty and if you find one, please share a photo and keep us updated on how the plant progresses for you!