That is excessive in the extreme, I pay about £4 to £5 each key.
There is a specific hand held machine for cutting these type of ford keys, which is simple to do and childs play.
Oh balls just noticed it's a mk1, so it will have a flat type key ?, I didn't notice that bit sorry.
So unfortunately seesm you are at thier mercy, short of a complete lock change from the scrapies!!
tabetha