Still, only a few thousand have been submitted to PCGS and only a few hundred to NGC, so there are many more of these somewhere. That's probably why prices have stayed relatively low (under $200 for MS64's like this).
Note the "Strong" designation. There are examples with less sharp dates and rims; these sell for a little less (though they may be more rare - it's impossible to know right now).
Although the chances of finding one now would be slim, it can't hurt to take a peek at your change, right? Note that no dimes prior to 1980 will have the P mintmark even though they were minted in Philadelphia.
Note: All my coins are in a safe deposit box. I keep nothing in my home.
This week's Coinweek Giveaway: http://www.coinweek.com/~cd53675ce0bee42
Also multiple contests going on at http://www.moderncoinmart.com/forum/forums/contests/