Refurbished Key?

Munts

Did a little searching here on the forums and I couldn't find the exact answer I was looking for.

I, like many others, received my Z with only 1 key

I have seen a lot of threads of getting a key from a dealer, getting it programmed, etc, can cost upwards of $350?

Now I have found a lot of refurbished keys on Ebay and other places for around $50. Would it be as easy as buying one of these keys and bringing my Z into the dealership and having them program it?

Would this save me any money? Or does the main costs lie within getting the key programmed? Sorry if I rambled, just want to not spend that much on a replacement key.

Thanks!