Typically, I don't like to comment on these posts b/c every collector should know that “if in doubt, walk away.” Trust your instincts. And if you've suggested as much, for eg: that the price is too high (& the seller hasn't responded) then walk.
Another thing to remedy doubt, is to use the vast # of tools at your disposal. Numista's page on the $1.00 FRN provides extensive info on the issue.
Here's another excellent resource:
STAR NOTE LOOK UP
(is a great site to look up whether a star note is somewhat uncommon)
On a side note:
Remember that the BEP often prints runs of one to a hundred million star notes. Few star note series are under a million (& tough) unlike most nations. (By comparison, the Bank of Canada may have printed one run/prefix of star notes over 1 million for their past $1.00 series). NO nation matches the # of replacements the USA produces so some of these stars are more common than regular (non star) runs. If you're okay with buying due to high demand (& ignoring the #'s) than forget all this.
And finally, if there's something else you want to find re: banknotes/numismatics, check out my:
SITES & FORUMS
page
(please & thank you!)
