I buy organ needles from jhittle.
He sells to the public although it says wholesale prices.
http://www.jhittlesewing.com/sewing/catalog.php
10 needles of one size for $1.80
the shipping is about $8 so I buy more than one thing to fill up the shipping, I also buy my rotary cutter blades at 10 for $14.90 for the 45mm.