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Tera Grand USB 2.0 to RS232 Serial DB9 Adapter USB2-RS232WN-06
4-Port USB to RS-232 Hub - UC2324, ATEN Converters | ATEN Corporate Headquarters
4 Port USB to DB9 RS232 Serial Adapter - Serial Cards & Adapters | StarTech.com
Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
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4 Port USB to RS232 Serial Adapter Hub - Serial Cards & Adapters | StarTech.com
4 Port Professional RS-232 USB 2.0 to Serial Adapter
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FTDI Serial USB RS232 Adapter 4 port Din Rail Industrial - Shentek
StarTech.com ICUSB23216FD USB to Serial Hub - 16 Port - COM Port Retention - Rack Mount and Daisy Chainable - FTDI USB to RS232 Hub - Newegg.com
4-Port USB to RS-232 DB9 Serial Adapter w/ Prolific Chipset
