Earlier quoted context omitted.
Note that this is an enhancement to an existing therapy. Depending on where you are in the world and the healthcare providers you have access to, the existing therapy called Transcranial Magnetic Stimulation (TMS) may be an option.
Some TMS clinics are offering the SAINT protocol off-label. Not covered by insurance of course, supposedly runs around $6k.
Unfortunately for SAINT it looks like you also need fMRI to correctly target the therapy...that's going to be a bit tougher to DIY.