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3mm is (roughly) 1/8", which I know is available in the US. Have you checked art stores? That is, not some crafty frou frou place like Michaels or Ben Franklins but hardcore art stores staffed by artnicks festooned with peircings, tats, strange clothes and even stranger hair. Pla-za Art, Pearl Art & Craft, and other stores like them generally have extensive loose paper stocks (like hot and cold pressed watercolor paper, several brands of illustration board and, usually, a dizzying array of other artist-grade materials for sale, which should also include the thinner foam core you're looking for.
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