Non-toxic paint for toy - advice needed :)

I have an old metal rocking horse with a wooden head which my DDs both played with when they were little. I painted it golden yellow then, but it's been stored in the loft for years and when I got it down for our little granddaughter, I realised it needs repainting (but I'm going to paint it in different colours!)
What I don't know is what paint to use. Ordinary gloss is terribly expensive even at places like Homebase. I won't need anything like 500mls either, even with two coats - probably half that amount. And I don't know which paint is suitable to paint children's toys. Does anyone know which paint I could safely use and the likely cost? Any advice?