Blacks, Millets and Yeomans sell them. However, if it's ankle support you're after, invest in a pair of german para boots, the Haix type (cheap on ebay) or more expensive Lowas, Altbergs etc. Even current issue boots offer a hell of alot more support for your ankles than Magnums. I've had 5 pairs and they've all gone to pot after 6 months.