Importation of Trade Samples in singapore

Bona fide trade samples (excluding liquors and tobacco) of a total value not exceeding $400/- on the CIF (Costs, Insurance and Freight) value may be imported without payment of duty and/or GST. A Customs In-Non-Payment (GST Relief) permit is required for the importation if the bona fide trade samples are controlled items. Supporting documents eg. invoice, bill of lading/airway bill are required to be produced to Customs at the entry point for verification.

Source: http://www.customs.gov.sg/leftNav/trad/imp/Importation+of+Trade+Samples.htm