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TRENDnet USB 2.0 to RS-232 DB9 Serial Converter, TU-S9
$1.25
StarTech.com 10-Feet DB9 RS232 Serial Null Modem Cable F/F (SCNM9FF)
$14.95
Plugable USB to RS-232 DB9 Serial Adapter (Prolific PL2303HX Rev D Chipset)
$2.24
SF Cable, 6 ft DB9 M/F Serial Extension Cable RS232 Black Color