Really depends on what you want it for...

If you are looking for a cheap flimsy child's mask, this is a very wise investment; the helmet is actually shockingly well-done given that it is made out of chintzy lightweight plastic and the two pieces fit together with the help of velcro straps. While the thing might look good in the dark on Halloween, upon closer inspection it is very clearly a flimsy, cheaply made knockoff that has absolutely no business sporting a $30 price tag (though realistically with Lucasfilm's ridiculous royalties, this may well be the cheapest you can find!) Do yourself a favor and if you're looking for a decent sith lord helmet, be prepared to shell out at least $10-$20 more on amazon. Quality stuff might be available elsewhere for cheaper, but somehow I doubt it.