Nintendo shipping Wii Classic Controller Pro this April, the price is reported to start at $19.99

Previously only available in Japan, this controller was part of a new black Wii. Compared to the Wiimote, it will have that now old-school look, plus a second row of shoulder buttons and ergonomic grips. The Classic Controller Pro is Nintendo’s answer to fans’ complaints about the original version that launched with the system in 2006.
Using the standard plugin, it will work for more than 450 Wii, WiiWare and Virtual Console titles.