Why are 1951-P MS66RD cents so pricey? and 1951-P mint set question

I was just on ebay pricing out 1951-P PCGS/NGC MS66RD cents. It looked like they were going for $100 - $200 or more. What's up with that? I was expecting them to be more like $30.
How much could I expect to have to spend to put together a nice 1951-P PCGS/NGC MS65-66 mint set (with RD, FS, FB, all that)?
How much could I expect to have to spend to put together a nice 1951-P PCGS/NGC MS65-66 mint set (with RD, FS, FB, all that)?
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slabbing it MS-66RD.
You might be able to land an MS-65RD 51-P at your target price of $30.