it's usually the norm now to get plastic toeclips, but there maybe a few specialist bike shops that can get them. Campagnolo used to make some pretty smart ones (albeit expensive)...Keep you're eye's peeled to the local bike magazines too, they might have manufacturers listed who might still make them.
Plastic toe clips are more user frindley than metal, they accept larger shoe witdths than metal, they are not as hard on your shoes, catch a plastic clip on pavement or a rock nothing happens, catch a metal and the story is diffrent. I have used both over the years, and would not use metal anymore.!!!