BD Micro-Fine Pen Needle - 32g -... https://www.amazon.com/dp/B01MSHLUN1?ref=ppx_pop_mob_ap_share This is what I ordered and they worked.

https://www.amazon.com/gp/product/B01MSHLUN1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I've been using these with no complaints. They look a little different than the needles that come with the pens but they are the same size and quite affordable.