Mine was £50 for my ST Escort from a guy on here. Not sure how much from Ford but I do remember someone saying around the £100 mark.
Give the carb cleaner ago, lots of crap will come out and its a cheap option.

Just leave it to dry which doesn't take long.I used a small paint brush to clean inside it.Don't forget to buy a new Gasket as mine was knackered after I took it off.