Im interested in one of these things as well.

I did a quick google for the chariot brand and they seem to be around £500! Dont think the little beggar is worth that much. 8O

I see halfords so some for around £100 which is a bit more palatable, in a sale at the moment as well.

Ebay has some as well which look ok,be interested to know if anyone has bought one similar to that.

ebay