Cheap green screen - where from?

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I'd like to try a bit of green screen video (using iMovie 09).

Anyone able to recommend me a source for a reasonable cost green screen? It doesn't have to be 'top quality' as I'm only having a bit of fun. Done all the usual searches, but all seem a bit over the top for what I'm after.

Wouldn't do any harm to get a white screen too, for photographic use while I'm at it.

[S. Gonzales Esq.]

http://www.calumetphoto.co.uk/ctl?query=chromagree...

[Scott328i]

http://cgi.ebay.co.uk/PhotoSEL-Green-ChromaKey-Bac...