Does anyone know why carbonless fanapart adhesive is so doggoned expensive?

We are presently paying more than $200 a gallon for this stuff. As I remember: decades ago the stuff was about $40 a gallon in quart containers, which was high, but not like this.

We presently buy Appvion brand, which is quite dependable... We've bought off-brands in the past, which have worked irregularly with sets of more than 4 parts.

Any good sources or alternatives?