External USB Fax Modem - 2-port - 56K - Bluetooth & Telecom Adapters
Amazon.com: StarTech.com USB 2.0 Fax Modem - 56K External Hardware Dial Up V.92 Modem/ Dongle/Adapter - Computer/Laptop Fax Modem - USB to Telephone Jack - USB Data Modem - Network Fax/CMR/POS (USB56KEMH2) :
Acer Modem AME-TG01 56000 BPS | eBay
SmartLink 56,000 bps Internal Voice Fax Modem v.90 PCI BUS by Archtek | eBay