I found an ebay seller with good (cheap) alternatives for these babies;
Topshop - £18. The American Apparel equivolents are £23!Topshop - £18
The ebay person also has cute (and very comfy-looking) leopard and zebra print leggings! Oh and I was only looking at the metallic green ones because I'm thinking of going as Old Gregg for Halloween! Although, if anyone else caught the last episode of "The Fashion Show" on ITV2, they did put lac leggings over metallic ones and it looked pretty awesome!