I'll try to be a little more helpful.
Though the ticket stubs for Mantle's 300th home run will generate interest (much more than the 300th home run for, say, a Musial, Frank Robinson, etc.), I think that has more to do with Mantle than No. 300. There are simply many Mantle and Yankees collectors, which generates demand. But honestly, 300 is a kind of arbitrary number. Yes, it's different than home run No. 299 or No. 301, but how much more different, because it's really just a nice, round number. It's not a major milestone (in my opinion) like home run No.1 or even No. 500, which has significance, or No. 536.
The estimate of $200-$500 you received is pretty broad. I agree $200 seems low, because, again, it's Mantle. But I'm not as sure that $500 is all that low. And yes, listing one on eBay will give you a better idea, but of course you'll have one less ticket stub in your possession.
Sorry I don't have a program to post.
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