The Smash GameCube controllers have a pretty long cable length but even those have become rather pricey. I don't know why the prices have increased all of the sudden since Nintendo didn't announce anything.
I sorta regret not buying the white Smash controller when it was cheap. Oh well, have four (2x Smash black, 1x GC black, 1x GC orange).
The four white NGC controllers I have are first batch originals marketed with the "Wii Family", not Smash version one's, (might upload a pic later). I've also have two blue emerald NGC controllers (they're beautiful!).
And yes, if you find one now they're expensive! So again, it might be (almost) the time to sell the four I have.