Up North,
Here's one site I found for M&Ms fabric: http://www.tabberone.com/fabrics/ForSale/ForSaleMMs.shtml
And this eBay seller: http://stores.ebay.com/Sew-Much-FUN-Fabric
Or these... http://search.ebay.com/search/search.dll?from=R40&_trksid=m37&satitle=M%26M+fabric&category0=