I now work in the UK so I can give some advice:

UK Wii games can be really really cheap (3DS as well actually - I got SSFIV for 10 pounds and Ghost Recon for 12 pounds - both brand new)

You can sometimes find second hand Wiis in the UK for about 50 pounds but you'll have to be quick to get them at that price. Basically, 50 pounds is the lowest price it'll ever get to for the near future.

UK Wii games are expensive if bought at launch but if you can wait a few months, most titles can be had for under 20 pounds. Have a look around ebay.co.uk, play.co.uk and amazon.co.uk for a better feel of the prices. I just saw Zumba Fitness 2 bundle going for 26 pounds on the Play.co.uk sale. UK retailers have sales throughout the year with the best sales coming in summer and winter so you can stock up on games then. One of the best prices for a Wii game I've seen was 4 pounds for Madworld. As I write this - Blockbuster UK is having a sale of their 2nd hand games - 3 for 12 pounds including free delivery.

Another hot deal was for the Black UK PAL Wii bundle with Mario Kart Pack Plus (•Wii Remote •Wii Nunchuk •Wii MotionPlus •Black Wii Wheel •Mario Kart) and Zumba Fitness 2  for116 pounds at an online retailer called The Hut

You can use Hotukdeals.com to keep an eye out for hot deals on uk wii games too.

Bottom line - I've really found that UK games are cheaper than US ones.