If you see extra remotes or nanchucks buy them it seems like those are pretty hard to find. We were lucky that they had nanchucks when we got the console but I was seeing remotes everywhere but didn't buy them. Took us a few days to find an extra remote. If you have a fry's electronics by you ours had quite a bit!
The classic controllers are pretty easy to find we picked two of those up as well. We also got the lithium batteries which are longer lasting then the standard but they are supposed to last longer we shall see!
In addition to the wii sports game that came with it we have zelda, warioware, rayman and super monkey ball but we bought them all seperate. We also downloaded some games from the virtual console. So much fun!
Good luck finding one!