Tripp Lite Keyspan 4-Port USB Serial Adapter (USA-49WG)
The 4-Port USB Serial Adapter from Keyspan makes it easy to connect four RS-232 serial devices to a USB port on a PC or Mac.
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As low as $93.14 out of 2 sellers
User Review: I have used Keyspans individual port adapters for several years. They work flawlessly and are quite fast.