This is Emeco’s $370 Navy chair (more info here):

This is Target’s ‘Cafe Aluminum Side Chair’, 2 for $249 (more info here):

Emeco’s registration number for the configuration of its chair is 2511360 (view in TARR here).

NY Times article ‘Look-Alikes Draw Lawyers Stares’ (reg req) reports on Emeco’s protest to Target.  The source of Target’s chair, Euro Style, indicates that it will change the design of the chair.

UPDATE: Here is the Sandra Dining Set, 6 for $750 (hat tip Teresa):