Yes, Emily is correct. Impress is the only place I know to buy the Fresh Inks and I've heard the formula is the same as Amuse. They are a pigment ink. If you sign up for their mailing list, periodically they will send you a coupon code. Not that I really have that many but that's how I acquired them - with a 20% off coupon. LOVE the colors.
I also forgot to say earlier than I do love Ranger Archival Inks and the Hero Arts Shadow inks but I hate that I can't get them off my clear stamps. If any one has ideas on how to clean them, please let me know!!