4 Port USB to DB9 RS232 Serial Adapter - Serial Cards & Adapters | StarTech.com
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StarTech 4-Port USB to Serial Adapter Hub with COM ICUSB2324X
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Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
StarTech.com 4 Port Serial Hub USB to RS232/RS485/RS422 Adapter, Industrial USB 2.0 to DB9 Serial Converter Hub, IP30 Rated, Din Rail Mountable Metal Serial Hub, 15kV ESD Protection - 6ft Locking Cable
USB to RS232 Hub (4-Port / Industrial) – CommFront
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