NG,
I've been twice graced with the Smith and Wollensky
kitchen tour, both times tagging along as Evil Ronnie was extended professional courtesy. Just before each dry-age beauty of a steak leaves the kitchen it's painted with melted caul fat, which adds a subtle subtext of rich silkiness. The dry-age meat locker is amazing, I occasionally have a dream where I'm trapped in there with just a book of matches, Weber grill and plenty of lump charcoal. (I didn't say it was a bad dream.

)
Far as places to buy suet go, I'd agree Paulina is a good place to start. I do suggest checking to make sure the packages are marked correctly, I bought a frozen package of caul fat at Paulina to use for wrapping sausages. When I got around to the caul fat portion of the recipe it was about 10pm, I had been making sausage for hours and what was marked Caul Fat turned out to be leaf lard. I'm still ticked off and holding a (very minor) grudge.
Enjoy,
Gary