I have always mailed to the US (and anywhere else in the world) when dealing privately, it's just when listed on ebay that I can't.
I only post by tracked/signed (usually at less than cost) so both parties are covered.
Insured covers up to £50 and £250 and am happy to post anywhere.
Thanks to the 5 people who last bought from me, greatly appreciated especially as all were happy.
Take care and have fun.