It depends whether it is the current model or previous generation. Currently they sell for 249$ and 279$ on the refurb site. So you could probably get that and they can save the tax and wait!
Another option is to keep it and backup (unless you already have one).
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Mac Mini i7 (mid-2011)
Arguably, if it exists in reality, it is realistic
If proof requires certainty, then arguably nothing can ever be proven
(unless you already have one).
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