Find some Euro distributors who will ship to the US. Even post-9/11, it's easy to ship real thujone-laced absinthe through customs. I've got together with friends and ordered many times through a Scotland-based distro until they stopped carrying it.

Didn't personally feel any odd effects from the thujone/wormwood. You have to dilute the stuff and use the usual techniques with the sugar cube for it to be even somewhat tasty and enjoyable. Still good stuff though.