Everything you listed I think I would buy used if possible. Nothing wrong with buying used. I think most places clean the gear, if not many places offer such a service.
I think helmet, and gloves would be the only thing I would definitely buy new. Socks are cheap enough to buy new.
A stick can be expensive, but I don't know if I would buy a used one, you don't know how it was used, and they break fairly easy.
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