You get a good battery charger for $40. http://www.amazon.com/Crosse-Technol...9896000&sr=1-1 Buy some rechargeable batteries for $10 for a 4-pack, that will last you 4 or 5 years before you have to replace them. I save about $250 a year on batteries. Do the math. To make a mount using a used inner tube go here.
http://www.youtube.com/watch?v=HrfZhEzjWwg