Microdosing where to get

Where can I get tirzepatide to microdose? I’m looking at taking about 1mg every other week without any b12/fillers just want to take the medication itself

My medspa I’ve gone to has given it to me in 4 prefilled syringes at 2.5 and now I’m learning it wouldn’t be a good idea to reuse the needles or keep it in the fridges for that many months

I want to find an online provider that can give me some vials to last for the next several months so I can take as desired. Any recommendations of which ones I should check out?

My bmi is about 32