Yeah, spindle, shaft, blades, skids... This are the parts that seem to break most often for me.
Flying over tall grass or a bean field, etc. is a good idea. Tall vegetation like that will 'bleed' energy from the rotor head more slowly than concrete
You can find parts listings on MANY sites. The BCP and pro are very popular, so lots of hobby sites stock parts. Here is the site of the company that distributes the E-flite brand:
http://www.horizonhobby.com/Products...arts%20Listing