I've seen it in loads of sports shops already. Where are you based, or where's convenient for you to shop?
Edit: sorry, just saw that you're in Angel. There's a big sports shop near where I work, in between Paternoster Square & Ludgate Hill, just Sth West of St. Paul's Churchyard. Sports World I think it's called. Always has a "Closing Down Sale" on and had plenty in stock last week.
Lillywhites in Piccadilly always has them too.
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