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I know Auralog's Tell Me More, which we used for awhile to learn Spanish, has an ESL product. Check with the Homeschool Buyer's Co-op (free to join) to see if/when they may have a group buy. Or try one of the used HS curricula sites.
That's all I can really think of, because I don't think there's much of a market for ESL in HS'ing. Oh, also try CurrClick:
They have loads of early learning materials that would work well.