If they're willing to ship it, you will probably be Ok, though it is illegal. Please note that absinthe has not been illegal in the US since 2007, but importing alcohol is still illegal, and regulated by both the ATF and your state LCC. I recently had to do some research for this myself, and I found out it's way too much trouble to obey the laws for importing alcohol. Depending on the state you live in, you would have to contact the liquor control commission for your state and fill out some forms, pay some taxes to the department of revenue, and since these are government agencies, it literally takes weeks to months for this to clear.
All you're really risking is that this will be confiscated before getting to your house. There is a very slight chance of this happening, but considering the bottle you want to purchase is $200, you should keep this in mind.
Since real (wormwood included) absinthe is legal in the states now, you may want to pick up a different brand at your local liquor store. You can also find wormwood itself in certain health food stores, if you simply wanted to experiment with the thujone.