Hi, where do I can get cheap micro electronics that fit in a 16in. wingspan SE5a

Micro electronic and cheap don't go well together! For that size of plane a Falcon brick would be OK on 72Mhz with a Futaba/Hitec Tx:http://www.bsdmicrorc.com/index.php?productID=540
or a Plantraco servo Rx on 900Mhz:http://www.bsdmicrorc.com/index.php?productID=729
with that kind of servos:http://www.bsdmicrorc.com/index.php?productID=602. Check Paul
Bradley site for inspiration:http://www.parmodels.com/elec_rc.htm
Slightly bigger models(around 20" span) are easier on the pocket book since you can use
regular micro equipment, bellow that size the sky is the limit!