What volume (not dosage, just the liquid volume in cc or mL...maybe even 'units') are you injecting?
What's your needle gauge for injecting?
SQ or IM?
Can try a standard online Diabetes supply store - my last purchase was 2 lots with 25 syringes each [with attached needle]. The insulin syringes are either in 'units' or cc or mL. Something like $8 USD, each lot (so $16 for 50 syringes).
I'm using a single system syringe with attached needle - used for drawing and injecting (SQ); 29g needle. The draw up is kinda slow, but not ridiculous. I used to work in a lab, so it's kinda therapeutic for me to watch the syringe slowly fill up, and try to evacuate any tiny air bubbles. The 29g is pretty painless to inject and deliver the E2. Found the 27g more painful with E2 delivery. Didn't like the idea of swapping out needles for draw up and delivery - was always concerned there might be that little bit left in the draw up hub that I'm not seeing (and wasting). My draw up is maybe alittle over one minute; delivery is around 30 secs; 0.3 cc volume.