Newark offers the Raspberry Pi Model B Computer Board
plus around $6
for shipping. That's tied with last week's mention as the lowest total price we've seen for this mini PC. (It's also a current price low by $2.) The Raspberry Pi is a credit card-sized, Linux-based computer on a single board. Powered from a microUSB socket, it features a 700MHz ARM processor,
512MB RAM, SD card slot (card not included, but one is required), Ethernet port, two USB 2.0 ports, HDMI output, and more.
More information, including complete specifications, is available here.
Update 1: Note that this computer board is currently on backorder, but is still available for purchase at this price.
Update 2: Specs corrected.