Well it has finally happened, after all my planning, conniving, paper used, and post-poning. i've decided to say screw it and jump on in. So i've finally started building a robot from scratch and I need some sensors beyond PIR and photo-resistors. Since the bot is 14.5 CM from servo center to end I figure a IR range finder in the range of 20 cm to 150 cm should fit my needs perfectly, but they cost 15$ a piece. Does anyone happen to know a place, besides Ebay, where I can get them cheaper?