This website provides information about patient assistance for Invega Sustenna.
This gives you a year at a time free of costs. If you don't meet all the requirements apply anyway and include a note explaining that you are unable to pay for the medication even though you have insurance/income too high/whatever. I have never been rejected and I get several meds through patient assistance, most on exemptions.

https://www.needymeds.org/brand-drug...ega%20Sustenna