Kenko Pro 300 DXG 1.4x Canon mount

Please help. I live in New Zealand and am looking for a Kenko Pro 300 DXG 1.4x Canon mount, green or blue dot, for my 70-300mm L lens. Where can I buy one from? All the ones in NZ are red dots if you can find one, half the online sites don't sell to NZ and even B and H only have a red dot version. You must be able to get green or blue dots somewhere because that's what the forum members say to buy, so where from?

Thanks.