For in-store pickup only, Micro Center offers the Raspberry Pi Model B+ Computer Board, model no. 83-16317, for $29.99. That's the lowest total price we could find by $15. The Raspberry Pi is a credit card-sized, Linux-based computer on a single board. It features a 700MHz ARM processor, 512MB RAM, micro SD card slot (card not included, but one is required), reset circuit, Ethernet port, four USB 2.0 ports, and HDMI output.