As Ausfree said.  They are big $$$$ at the dealers and new ones will require programming at a dealer or someone who has the right computer so the costs of this need to be taken into account.  
You can buy them on Ebay UK very cheap but you need to get the right frequency - 315mHz I think but not 100% sure.  The correct part number is on the back of your fob.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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