It's about USD 2B worth of purchases:

* https://archive.is/https://www.washingtonpost.com/politics/2...

* https://theconversation.com/american-farmers-who-once-fed-th...

* https://www.usatoday.com/story/opinion/voices/2025/02/13/mus...

* https://betterworldcampaign.org/blog/what-us-farmers-get-fro...

And in addition to farmers, a lot of companies/non-profits (for, e.g., logistics) were paid by USAID programs, as well as researchers for things like global health initiatives.