Pacifique Absinthe by Pacific Distilleries in Woodinville is, as alight mentioned, an option. It's a very good one, in fact. Lucid is another good brand. Kubler is absinthe in the Swess "la bleue" (clear, not green) style and is tasty. Absente was a pre-ban brand which used a cousin of Grand Wormwood, and it is now sold with Grand Wormwood as Grand Absente; this is okay but very sweet. Absinthe is usually quite strong, and the user dilutes it to his or her taste. Pacifique, Lucid or Kubler cost around $70-80 in Washington, and are worth the price.
Thujone content of real absinthe is negligible. It does have a more, well, lucid effect if you get drunk on it - you'll feel clearer than you are.
A few warnings. First, DO NOT light absinthe. This is the Czech method. Czech absinthe is foul. All of it, to varying degrees - the original (since 1980 - no, not 1890) and worst is Hill's. To really prep absinthe, put your absinthe in a glass, prop an absinthe spoon (or a fork or two nested forks) across the glass, put sugar cubes on top (as many as you like, usually one to three) then pour ice cold, filtered water over the sugar - as slowly as you possibly can, since the various oils in the herbs precipitate out of the liquid at various precise dilution levels; the slower you go, the wider the flavors, generally. The louche, pronounced "loosh", is the change from pale transparent green to milky white as the oils precipitate out, and is part of the magic - when finished, hold it up to a bright light to see the beautiful fiery colors hidden in the milky liquid.
Also: Le Tourment Vert. "The Green Torment". It's a lovely bottle containing a blue-green liquid, and it'll set you back less than $40. It smells like Aqua Velva, tastes horrible, and will not louche at all. It's a waste of money.
If you want to see prep done with a proper absinthe glass, absinthe spoon and glass absinthe fountain, go to the Deluxe on Broadway. The Deluxe serves Lucid, last I checked, and a measure is around $10. It'll give you an idea of how the prep goes, though lacking the fountain you only need a pitcher that will pour a thin, fine drip without dribbling everywhere.