This button showed up in the mail yesterday (the only thing in the package). I suspect it's a surprise gift from RM (who is being coy about it). Of course, it may be that my Alzheimer's is acting up and there's another explanation (e.g., I ordered it and forgot). But I think it's the former. Thanks, RM.
If you search for "Jack Kerouac button" on eBay, it's the first item that shows up (in case you want to send one to a Kerouac friend).