Hi, What are you doing with the resistors? Did you burn one up?? Or why did they "not work"??
Most Arduino-related things are low power and .1 or .25 watt resistors are OK. What power is involved with what you are doing?
To have almost any value you need in stock, get a resistor assortment like these: http://goo.gl/PoQhr
Or if you really want 2100 resistors for $7.50 
get these: http://goo.gl/obVhv
DISCLAIMER: Mentioned stuff from my own shop...