Can I buy just a toilet tank lid? My wife broke our 2nd bathroom's. Do I have to buy a whole new tank?

If you can tell me, if i do end up having to replace the whole darned tank, how hard of a job is that? Can I do it? (not the most experienced home repair guru) Are toilet tanks standard, meaning will any toilet tank fit any toilet? I know, that's more that one question, HELP!!!
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