I can easily find fresh broccoli for around $1.50/lb at several grocery stores near me here in the US. There's loads of stores with a variety of vegetables that are decently cheap and are also eligible under my state's food stamp/child food supplement programs for low income people.

Looking at price indexes from the US Fed it might just be cheap for me here. The average seems close to $2/lb.

https://fred.stlouisfed.org/series/APU0000712412