Reddit mentions of 3cc Luer Lock Syringe (No Needle), Box of 100

Definitely only buy medical grade micron filters. You should be able to find them with a simple Google search. Let me see what I can find.

Edit: Here are some. They are non-sterile, but that should be fine. If you really feel like it you can find sterile ones, but it's unnecessary as those are more for research in bio-safety cabinets and clean rooms.

Also, you'll need these. The filters and these syringes have what's called a "leur-lock" connection, so if you plan on using micron wheel filters then you'll also need to purchase syringes that are compatible with them.

Biomed Scientific Syringe Filters PTFE Membrane 25mm Diameter 0.22um Pore Size non Sterile Pack of 10 https://www.amazon.com/dp/B06XPD6PYG/ref=cm_sw_r_cp_apa_i_7dHYDbTZA3G38

3cc Luer Lock Syringe (No Needle), Box of 100 https://www.amazon.com/dp/B01N7IJXO5/ref=cm_sw_r_cp_apa_i_rfHYDbYENAJ6G

You will need both but can use these for insulin ones

https://www.exchangesupplies.org/shopdisp_sterifilt_universal.php