The X3 controller only is $200. The power supply is $20. The pH probe is $37. The temp sensor is $25. That is $282. The starter kits are $300 but come with either a leak detector or wifi power strip. They both are another $40. If you buy controller only you will also need the power supply as controller only is controller only. It does not come with the power supply.Not sure how I feel about the x8. By buying the x3/4 and the X8, you are now on par with the cost of the GHL or Apex. If I am going to be on par with the Apex, I might as well go with the apex because the testing and dosing add ons for the Apex actually make it more affordable for the all in.
Just wish someone had the X3 controller and the PH probe in stock. Done want the entire starter package.