If you have an constant internet connection in your house already (cable, fiber or DSL) then its the cost of a wireless router and an adapter for your Wii. You can certainly do it for $150-$200.
If not, its the cost of getting internet access to the house as well which is usually $30-60 a month.
Wi-Fi does not cost money. It is free.
I have a Samsung Monte, It does have WIFI, but if you can connect to someones Internet Connection, It doesn't cost. How ever if you don't it may cost an Extreme amount of money.
Technically no using wifi is free but paying for the wifi costs money (Apple doesn't charge you but in order to get Internet you will need wifi to go mobile which will cost the owner money.) I use my next door neighbors they don't mind.
It depends on the airport your flying in. Most cost money. I'm not sure how much.
I will assume you meant, "how much does wifi cost?". In that case you will need to pay for high speed internet from your phone or cable company and that will cost between $30 and $50 per month. You will also need to buy a wireless router if your internet provider does provide you one; that will be a one time cost of between $20 to $40.
30 to 100 dollars
39.99
no, you just have to have a wi-fi router and Internet
none but you have to pay 4 wifi
$249 for the wifi version and $299 for the 3g.
No, wifi uses the internet in your house, school, or where ever you are. You won't be charged for data from your cell phone provider.
Nothing. (as I'm told!)