Matchbox- Models of Yesteryear range.
Ebay is probably the best source for these, although they do turn up quite frequently in second hand shops and markets.
Be warned: Some items in the range can be very pricey, but your average Model-T Ford types are easily and cheaply acquired.
Also, if you cannot see the item in person, stick to the cars, as the range seems to be designed to fit the box rather than as a scale.