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Re:Tesla hikes solar roof price on contracts signed over a y... by hn8788 on Monday April 12, 2021 @07:59AM (#26778381)
I don't know if it applies, but what you're talking about sounds like Promissory Estoppel.

https://www.law.cornell.edu/wex/promissory_estoppel

Re:Tesla hikes solar roof price on contracts signed over a y... by andreareina on Monday April 12, 2021 @10:10AM (#26779629)
That's the one I was thinking about yeah.