Visit Outpost.com.
Enter sku #: 61414 in the search field on the main page.
The results will show a PDA Serial/USB Adapter by Aten, for $19.95 w/overnight shipping.
Description (Manufacturer# G-UC232A)
Users have the capability to utilize the adapter with serial port interface in an easy-to-use environment, The adapter is designed for connections to Cellular phone, PDA, digital cameras, modems, or ISDN terminal adapters through your USB port with a 230 kbps data transfer rate.
Installation is easy. Simply plug a serial device into the UC-232A adapter and plug the USB port into the computer. No IRQs are needed so there are no IRQ or Com port conflicts.
Features:
Supports automatic handshake mode
230kbps data transfer rate
Supports remote wake-up and power management
96 byte buffer each for upstream and downstream data flow
Easy installation
Frees your RS-232 ports for other uses
No IRQs, no IRQ conflicts
1-Year Limited Warranty
Specifications:
Connectors:
USB: Type A
Serial: DB-9 Male
Cable Length: 14"
OS Support: Windows 95OSR2.1/98/98SE/2000
Data Transfer Rate: 230 kbps
By the way, the adapter you linked to is a 25 pin version. (The serial connection is a 9 pin.)
-Rab