$us85 plus shipping(ebay) plus a SD memory card. Over here in NZ 'Noel Leemings' has them for about $nz230 plus memory card. They do come with built in memory too but it is only 3mb.
http://www2.oregonscientific.com/shop/product.asp?cid=9&scid=20&pid=771
geezas thats cheap, how good an image do they put out ? 10 years ago i bolted a tin frame to an old helmet and mounted a handy cam and backpack and hit the local quarry, i had a great time thinking i had full crusty images, well not quite, the whole thing when watched back was prity much the handle bars and the front wheel and was also lopt sided as the helmet was too heavy on one side,setting up the point to shoot was too hard to get right.
But these little camera look look awsome and no wires etc, they look crazy, but how good is the video, im just blown away by this, batteries and an Sd card, ill be fuct, technology god love it !