How about a Skype phone for $6.99? Well, here you go!

Over on sellout.woot, a Yahoo! Shopping partner, there's a US Robotics USB Internet Phone

That's no typo.  Even comes with a 90-day warranty.

As the site notes, the US Robotics USR9601 USB Internet Phone works on Windows 2000 and XP and is USB 1.1 and 2.0 compatible. It also works with OS X. All you need is a CD-ROM drive, 128 MB of RAM, 5 MB of free hard drive and a 400 MHz Pentium II.

Specs and feats? Comin' right atcha: Features:

• Auto interfacing with existing Skype accounts
• Makes Internet calling as simple and comfortable as standard telephone calling Excellent Voice Quality
• Integrated echo cancellation and noise reduction technology delivers life- like conversation quality
• Full-duplex operation eliminates call clipping Full-Featured LCD Screen
• Blue, high-resolution, back-lit, graphical LCD capable of displaying any language characters
• LCD status indication for online/offline and missed calls
• Supports Caller ID – Displays caller and telephone number
• Current date and time displayed (as read from host computer)
• Easy to Install and Use
• Simple to install – Supports Plug-and-Play so when it is attached to a computer’s USB port it automatically installs (requires CD for Skype)
• Answer, hang up and dial calls with the touch of a button
• Portable – Easy to carry around, perfect for traveling
• Classic hand-set styling for comfortable use, even on long calls
• Broad Compatibility
• Supports Windows 2000 & XP operating systems
• Compatible with USB 1.1 and USB 2.0 ports

Specifications:

• Plug-and-Play for auto installation
• Echo cancellation and noise reduction technology
• Supports full-duplex communication
• Dialed and incoming number memory
• Supports USB 1.1 and 2.0 ports
• USB Powered (no external power supply needed)
• USB Port: A-type interface, USB 1.1
• Dot matrix LCD Screen: Time and date, Caller ID, Call states and duration
• Dimensions/Weight: 5.9×1.75 x .8 in / 0.44 lb

Handset Functionality

• Blue back-lit display
• Echo cancellation, noise reduction
• Dial Skype contacts (Speed Dial)
• Dial Skype-Out numbers using phone keypad
• Place calls on hold and mute calls
• LCD State Indications: Skype online, Skype offline & missed calls
• Selectable ring tones

Minimum System Requirements

• 400 MHz Pentium II PC w/ 128MB RAM and 5MB free hard disk space
• Available USB port or a USB hub with external power supply
• Windows XP/2000 or Macintosh X or higher
• CD-ROM drive
• Internet Connection (Broadband recommended)
• Skype software (on included CD ROM)

If you must take Skype around with you, and are not in the mood to spend $99.99 for one of those officially certified Skype handsets, this US Robotics thingie sounds like something you might wish to consider.