http://www.toysrus.com/product/index.jsp?productId=3347953
This wii bundle at TRU seems like a good deal. The game alone is $50, the extra wiimote and nunchuck would run about $60, plus the console for $250. Of course, shipping will kill you, so if you can find it in the store that's better.
I wasn't sure if you were asking about what accessories to buy, or where to find the wii. In terms of accessories, so far we've bought 3 additional wiimotes (costco has a nunchuck/wiimote bundle for $51.99). we've bought 2 extra steering wheels (although my kids prefer the nunchuck for mario kart). I bought a usb powered remote charger (although if you plug it into the back of your wii it only charges while the wii is turned on, which means you can't use whichever remote is charging while you are playing). Next time I will just get a charger with an AC adaptor.
we went nuts buying games, and the only 2 we ever play are the wii sports that came with the machine and mario kart.
at first I did not like the wii fit, but it has grown on me. I use it for 10-20 minutes after work to do some stepping or aerobic games, and then about 20 min before bed to do yoga and stretching. so if you decide to get a wii fit, I would highly recommend getting a silicon cover for it. I got mine on ebay for less than $10 shipped.
here's something else I did. we have our wii in our office on the tv stand. so on the side of the tv stand I stuck on those 3m hooks that use adhesive and come off (supposedly) easily. and I hung all 4 wiimotes on these hooks on the side of the tv stand (facing the computer desk so they're not too apparent), and that way they are nearby but out of the way.