Amazon has some rOtring 500 mechanical pencils in 0.5mm or 0.7mm for $8. There’s also a Rapid Pro 2.0mm that’s currently out of stock but orderable for $14.23.
rOtring 500 mechanical pencils in 0.5mm https://www.amazon.com/gp/product…0DER&
rOtring 500 mechanical pencils in 0.7mm https://www.amazon.com/gp/product…0DER&
rOtring Rapid Pro 2.0mm https://www.amazon.com/gp/product…0DER&