Hit up pawn stores for wii motes. You can probably find them for $10 each and in most colors. Also watch ebay auctions. I havent paid full price for any of my PS3 controllers between the two places (Actually havent spent over $25 on any of them so far).
You would think that and I read that a lot on VG collect where users check out pawn stores for stuff but honest to God truth. Where I live, not a single pawn shop sells anything before the current generation consoles, or accessories. No wii motes. They do not sell controllers, cords, etc. separate from consoles. Trust me I doubled checked them all to make sure. Only Wii remotes are the one's they are selling with the actual Wii system. And a few of them even said that within a few months, they are no longer selling Wii consoles or games anymore. The only reason to visit a pawn shop where I live is to pawn something for cash. For video game purposes, if your not buying an actual console, or a game for it, no reason to go.
I have talked to them about selling older stuff and they keep telling me that they would loose money because no one buys that stuff.