Elfen Lied Merchandise has been available to fans of the series since not long after its publication as a manga, and television broadcast as an anime series. Many pieces out on the market are fan-made or were made well after the series initial run. For the purposes of this article, unless they are accompanied by some manner of separate collectible, DVD and (potential future releases of) Blu-Ray sets will not be counted here, nor will manga compilations unless they are of collectible note.
There are extremely rare dolls of Nyu and Nana, having interchangeable heads (Grim Lucy and Smiling Nyu; Nana with and without the 'hairband' tie given her by Kurama), with Nana sporting her anime pink hair instead of her manga blue hair. These can easily fetch above One Thousand USD on Ebay. To date, they seem to be the only figures of any kind produced by an officially licensed manufacturer.
As with many other fandoms, dedicated fans will take to dressing as their favorite character - the most prominent in this case being Lucy or Nyu. Two main types of costume seem to be immediately prevalent. One is Lucy in her skirt and strap-top. The other is 'Jester' Nyu with a large 'joker' hat covering her horns with a red blouse and a yellow skirt - although Lucy was seen in this dress as well. These vary in price, largely depending on the level of detail, and seem to be entirely fan-made. Horns of course are another prominent cos-play item, again varying in quality and price.
Memorable scenes, iconic imagery and art of every stripe relating to Elfen Lied, are available to the consumer ranging from the humorous, to the deadly serious, much like the series itself, usually in the form of T-Shirts.
This category involves clocks, cloth or poster prints, electronic signs, and even lamps decorated with imagery from the series.
There are numerous pins, wallet-type holders, charms, pendants, watches, candy or cigarette cases, and notably, a key-chain in the shape of the Diclonius Helmet, as seen in various points in the series.
Though the official soundtrack releases have been few and far between, fans are fond of collecting the anime series' memorable music tracks, and have also expressed interest in recordings of the original Elfenlied poem and song. These are available in iterations official and otherwise.