I was also luck to win the lottery and get a free Bus Pirate 3.8 pcb. It is already assembled and working. I got a FT232RL for $2.35 from Ebay. Search for a seller named polida2008. The micro USB connector used in the v3.8 board was also ordered from Ebay - 5 pcs for $1.19 total. The voltage regulators and the PIC I got from Microchip as free samples :)