Are yours the kind where the tens unit cord snaps onto the electrode, or is there a shorter bit of cord attached to the pad which attaches to the unit? This page has both: https://www.amazon.com/stores/node/14057779011?_encoding=UTF8&field-lbr_brands_browse-bin=Discount%20TENS&ref_=bl_dp_s_web_14057779011

I got these ones from that brand and they're super duper sticky, they'll definitely last a long while: https://www.amazon.com/gp/product/B01N3N6IJ6/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1