StarTech ICUSB232PRO USB to RS-232 Adapter Cable

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$52.56 at HP Small & Medium Business Store
$30.99 at Dell.com
$30.99 at Dell Small Business
SIIG RS-232 4.92 ft. Serial Cable

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Belkin F5U409V1 USB to Serial Adapter Cable

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$21.88 at xtreamgadgets
$36.65 at HP Small & Medium Business Store
$25.99 at Dell.com