Of course they do. That's how most of use get our breadboard wires, caps, resistors, ICs, etc... Everyone in the electronics community knows that sparkfun(and sites like adafruit) aren't the cheapest in the industry, but that's not why we buy from them. Heck even mouser or digikey beat them on most stuff.

I buy from sparkfun because: - They provide eagle files and data sheets for most things they carry - They provide real time customer support in IRC - They don't screw up orders or take 6 weeks to ship - They test, use, continuously improve, and deprecate their own stuff

I know it doesn't apply in this case, but go try to find board files, schematics, or datasheets for most of this stuff on dx. There's a reason sparkfun is so popular.