I would recommend these it's a variety of different sizes and they don't have the water proof material on the back that make them slip https://www.amazon.com/dp/B0788KNKBG?ref=emc_p_m_5_mob_t
These also seem like a good option too https://www.amazon.com/gp/aw/d/B011ZBFOJO/ref=sspa_mw_detail_5?ie=UTF8&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzNkMyWFhDTTFETDRZJmVuY3J5cHRlZElkPUEwMjc0NDc5MVFYWlBRUEZOQ1Y0WiZlbmNyeXB0ZWRBZElkPUEwMDkyMjE4M0QzUVJQOExFQUI5TyZ3aWRnZXROYW1lPXNwX3Bob25lX2RldGFpbCZhY3Rpb249Y2xpY2tSZWRpcmVjdA==&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9kZXRhaWwp13NParams
I don't really buy pads from Amazon tho so here are my favorite affordable esty shops if you wanna take a look
https://www.etsy.com/shop/TKReusableshop