I’ve used these from Amazon. They’re very cheap and work great.

MedtFine Insulin Pen Needles (32G... https://www.amazon.com/dp/B0149SEBJE?ref=ppx_pop_mob_ap_share

https://www.amazon.com/gp/product/B0149SEBJE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I got 4 weeks of .25 and 3 weeks of about .40. You don’t need to use a syringe. You can buy a box of pen needles on Amazon

https://www.amazon.com/gp/aw/d/B0149SEBJE?psc=1&ref=ppx_pop_mob_b_asin_title