Take a look in the back of Classic Ford magazine - WHSmith stock it, as well as the odd petrol station.

I know they're not the most desirable car but seriously look at a good 4 door Mk1 Escort - cheap and very, very tunable.
Also, I think the next car to shoot up in value will be the Mk1 Sierra or Mk3 Escorts ie XR3 carb jobbies...

Keep it old skool!