Best budget doser for 3 part dosing

[coloradoreefer94]

I want to start automating my 3 part dosing but want to try to keep it under $200. What are the best dosing pumps for 3 seperate solutions.

 

[TX_REEF]

I use this 4-head pump on both of my systems. I enjoy it due to the simplicity (no pun intended), reliability, and price: https://amzn.to/3VcwFV7