You can find it on Amazon:

SAFRAN Menengic kahvesi ( pistachio coffee ) https://www.amazon.com/dp/B07MCQ9PZB/ref=cm_sw_r_awdo_8CVWPV1FDZBYTQEFC93J

I personally prefer buying them in jars. They're roasted then ground into a puree like nut butter. Keep in mind they're ground with shells. When prepared like Turkish coffee, the crushed shells act like coffee grounds and sink to the bottom, while the creamy texture of the menengic make one awesomely smooth drink.

If you do pick up a jar, prepare it like Turkish coffee on the stovetop. That's when the flavor really develops. Then you can either drink it plain, or use it to make other coffee drinks. I was hooked on menengic lattes for a while :)

Edit: found this blog entry. Adding it incase it helps. https://www.anissas.com/menengic-a-turkish-coffee-that-is-not-coffee-at-all/