I bought one a couple of weeks ago - cost about £45 from Vaux dealer. Should have it in stock
Fitting is not too bad if your got smallish hands as its between/behind the front engine mount and power steering pump bracket. best approached from underneath. Put some grease on the o-ring before you put it in and its much easier.
If you use a haynes manual it tells you to take half the back of the engine off - injector rail, fan belt, air pipe etc. I found this to be an absolute load of ********. This is only to get at the connector plug. If you're lucky none of this needs to be done.