You could try ebay, most of them are selling for stupid prices but i have seen a buy it now for a wiimote and nunchuck for £48.00 including delivery, the person is located in the UK but is selling the jap version, the only difference to the UK version is the instructions are in japanese. They have 100 in total for sale!
Official Nintendo Wii remote Wiimote & Nunchuck - BNIB on eBay, also, Nintendo Wii, Accessories, Video Games (end time 15-Dec-07 21:19:08 GMT)
Edit: The seller has increased the price, it's now £50.