If you buy the Grand Market in your turn, can you then use spare copper to buy something else? Or does doing so forbid you from having bought the Grand Market?
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No. Technically, you play all treasure cards you want to use
The pseudo-exception is in the case of Black Market, which adds an extra buy phase. You could buy a Grand Market from a Black Market play, and then play coppers to use in your end-of-turn buy phase.