The pint-sizedRaspberry Picomputer is due to hit doorsteps and developing markets any time now, but that hasn’t stopped some ardent fans from igniting an eBay bidding war over some pre-production units. So far, the Raspberry Pi Foundation has put four pre-production models on eBay, and all of them command a pretty hefty premium over the vaunted $35 price tag that their mass-produced brethren will sport.