Where can I get a fin script quickly?

[NYK155]

I've been on Fin and close to 3 years and my current prescription has expired and only have a few pills left. I've historically taken 1 mg daily. I was going to cut the pills in half or quarters until I can find a script. Anyone know about Keeps or Hims? Are they worth a try. How long can I go without Fin in my system before I'm negatively impacted?