Can I get Sweet Potato Vine in NL?

Hi,
Sorry for not writing in Dutch, but I'm not so good at it!
I have been trying, for years, to find the charteuse (light green) variety of Sweet Pottao Vynes (Marguerite or Sweet Caroline, for example). But with no success at all. They are pretty common in France and I have attempted to bring some shoots from there, but they didn't work.
Would someone be so kind to let me know where can I buy some?
Thank you and kind regards,
Valeria Siemelink