There are several CNC machines available at makersmiths and each one has their own settings and usage scenarios.
End Mills for Makersmiths CNC machines may be purchased at the following locations and/or websites:
Leesburg:
Woodcraft has an assortment of end mills & router bits; many suitable for cutting wood
Web Sites:
Kodiak Cutting: http://www.kodiakcuttingtools.com/
Think & Tinker: http://www.precisebits.com/