The 300SpartanWarriors online store includes the rarest collection available of the original 1998 Frank Miller '300' material which has been out of circulation now for a decade. This can be confirmed via the Google search engine, etc., therefore, these articles will be prized additions for the '300' collector as several of the items are limited editions.
The 300 Spartans Art.com images contain the different variations of posters that are available through this conduit. The dimensions are different in many cases along with the different quality prints that are available, however, the common feature is that they all feature artwork with respect to King Leonidas, the 300 Spartans or the Battle of Thermopylae.
In addition, a 300 Spartans Amazon store which can be seen below aggregates the '300' merchandise which is available and for comparably lower prices than those found elsewhere.