New lower price for Axon II ($78) and Axon Mote ($58).
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A low value resistor could be used to drive the motor at ~5V from the 9V.
Never use a 7805 on a 9V-battery (since it's end-of-life voltage is only 5.4V and the 7805 needs at least 8V in.Besides, you would not get a voltage regulator mounting just the 7805, since it would oscillate periodical or all the time - mount 100nF to 220nF on the input and 22µF on the output - both as close to the pins of the 7805 as possible.
I am still searching for 100nF~220nF.
heres both of the caps http://www.eleparts.co.kr/front/productdetail.php?productcode=002002023001000623http://www.eleparts.co.kr/front/productdetail.php?productcode=002002023001000624