I have had a Rubbermaid (Carex) plastic shower chair for about a decade - tough sum bitch

https://www.amazon.com/Carex-Universal-Bath-Shower-Chair/dp/B000AEGCUI/ref=mp_s_a_1_5?keywords=rubbermaid+shower+chair&qid=1576539365&sprefix=rubbermaid+shower+&sr=8-5