This is the brand I use:
Ziyad Soup Starter Jameed Kishk Concentrate, Ready to Cook, 1.1 lbs, (Pack of 2) https://www.amazon.com/dp/B017GL23TG/ref=cm_sw_r_cp_api_i_GCAHEPN3RXJMHST9901S?_encoding=UTF8&psc=1
I get it from a local Arab store (I’m in Chicago) and I want to say it’s $10 or less for a pack of two, but if worst comes to worst you can get it from Amazon!
My go to for Jameed is Amazon, where are you located in the U.S?