recommendations for opks?

Miriam • 💙03/2018, 🌈 08/2018, 🌈 01/2019 💕12/2019, ?12/2021
So I got off the pill two months ago and am looking for a good opk to determine when I'm ovulating/if ive started ovulating yet. Do you guys have any suggestions for good brands, preferably ones that i can get at cvs or walgreens? Thanks!