Where to order electronic components from:
http://www.abra-electronics.com/
http://www.futurlec.com - sometimes they charge the user without sending the item - I think.
http://www.speechchips.com - voice synthesizers and more.
Where to get mechanical parts from:
McMasterCarr
Small parts
good fellow
Where to get bio/electrodes/animal related stuff:
carolina biological
niles bio
a-m systems
alascience
harvard apparatus
cole-parmer
A1cardiology - I think it's http://www.a1cardiology.com
Learning the basic competency you should know when you come to BENG402:
http://www.allaboutcircuits.com - circuits and electronics are needed. Watch the videos!
http://www.mathworks.com - Matlab is needed.