TER General Board
A Starbucks gift card if they like coffee or a gift card to her favorite restaurant. Since you said they are "special providers" you probably know what they like.
As for gift lists, I recently posted one on my site ONLY because several guys were asking what I like and that they think a list would be good so I was like ok. That's the only reason why I did it cause I care about feedback and listen to it 
But like I said it on my social media once, guys always wonder what to bring to a date when even a couple of bottles of water are good cause they save me a trip to Walgreens! What can I say, I drink lots of water!
Ideas for your atf?
If she travels-
Travel gadgets like a hotel safety door lock, small multi purpose flashlight (visit AAA)
luggage or fold-able bags(some museums have really pretty ones they sell online)
travel cosmetic bag(s)
a soft throw blanket to curl up in or-
-a cozy bathrobe..
perfume (if she wears perfume)
jewelry that reminds you of her Own incall?
monogrammed towels, or just big fluffy towels, bath salts, lightly scented soaps or shower gels
flameless candles (battery operated)
I like flowers
some may not.... jewelry that reminds you of her
I once received mooncakeYummm
special glassware (flutes, wine etc) for her incall and the bottle to go with them.
But mostly -anything you would like her to have because it is the thought that counts. and although you think gift cards are impersonal- every time I use a gift card I think of that person who gave it to me. (Such a sweetie.
How about joint bank accounts? Yay!
A gift certificate to honey baked ham might be good
of course I'd be happy with a good orgasm and a new toy 
the possibilities are endless without breaking the bank 
That's freaking hilarious