On Amazon, on the recommendation of MissOrchidGirl from YouTube:
8 Pcs White Self Watering Planter,Plastic Flower Plant Pot with Inner Pot,4 Inch African Violet Pots for Home Decoration,Herbs,All House Plants,Succulents https://www.amazon.com/dp/B08SQF72K4/ref=cm_sw_r_apan_glt_fabc_9J8680FE7A502APYGJW9?_encoding=UTF8&psc=1
I add wicks made of microfiber cloth since these pots don't come with any.
These are my go to pots: https://www.amazon.com/gp/product/B08SQF72K4/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
These are my favorite smaller pots:
https://www.amazon.com/gp/product/B08SQF72K4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
These for larger plants:
https://www.amazon.com/gp/product/B07SPPKNM4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
And my biggest floor plants (monsteras) are in these:
https://www.amazon.com/gp/product/B09YRRR632/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Hope that helps. The smallest ones I have repurchased over and over, and they're perfect even for larger plants that enjoy being a little rootbound.