Help needed please.

[forbefor]

Hi all,
I need a crankshaft sensor for my 1997 Maverick.
I have contacted Ford a nice man whistled throught his teeth and then said "its gone cost around £150".
I tried Nissan because everyone keeps telling me its the same engine ,the guy there was as helpful as a chocolate fire guard telling me I needed to provide my registration so I told him,he was very quick I was only on hold 5 minuets,he then said my car was a Ford Maverick( told you he was quick I told him it was a ford in the first ten seconds of speaking to him) and he politely told me that he was a Nissan dealer to which I replied "I know but its the same engine" his reply" I cant do a price search without a reg" so use mine he cant its a Ford so I politely said thanks and hung up.
So please can anybody tell me where I can get one thats not going to cost me a fortune before my husband bans me from driving it in case I do some damage.