Try Hamleys that's where i got mine
Yes, you do need the Wii console to buy wii fit.
no you dont but you will need a balence board go to this sight to buy www.game.co.uk/Games/Wii/Fitness-and-Health/Wii-Fit-Plus-with-Wii-Balance-Board/~r342278/?s=wii+fit+plus+and+balence+bord in UK
No you need to separately buy Wii fit. Although the Wii comes with Wii Sports.
yes
WII-FIT? IT COMES WITH THE WII!
I'm pretty sure.
Yes, the Wii Fit accessories are just add-ons.
It depends on your style. Wii Fit is $90, Mario Kart is $50. If you like racing games, get Mario Kart. If you're into keeping fit, get Wii Fit.
no
No. All you need is the balance board and the Wii Fit Plus software. You don't need the original Wii Fit game to play the new one.
I don't think it will work. They are made differently. You'd better buy one that fit for US wii systems. There are lots of resources online. Have a look and find out what you want. http://www.dinodirect.com/Wii-Accessories/Wii-Controllers/
If you like exercising and getting fit, get wii fit. If you like action games wile racing get Mario Kart wii, but i recamend you to get Mario Kart wii it is soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo fun