You're far better off with nintendo's own wiimotes. you can get wiimotes with built in wii motion plus, and of course the wii play (game) + wiimote package can still be found in some stores.
Apart from the usual video game stores some places might suprise you. Try walmart, target, best buy, or any large store that deals in bulk. I like buying used but you would really have to know a used video game store well to know you're getting a good deal on a refurbished wiimote.
and don't be afraid to use the phone book or otherwise check the internet to get an idea what a good bargain is like. good luck