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Jaycar used to have a green 10mW module. It's not a pen and would need a housing and a 3V power supply.
It's also not the cheapest option around at ~$79.
It looks like it is now a discontinued item but if you visit the Launceston store and they don't have one, ask them to check stock nation-wide for catalogue number ST-3117, they might be able to get one in for you from another store.
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