If have an acceptance from Brandeis, I’m pretty sure you applied Early Decision. Under the ED agreement you signed, you are committed to Brandeis unless the financial aid that they offer makes it unaffordable for you and your parents. It sounds like this is not the case since you said your parents could scrape the money together. Instead you have more affordable options. That is not the same as Brandeis being unaffordable - it means the other colleges are more affordable.
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