Looks like these guys just came back into stock a moment ago. I just bought two of these 5 packs. At $10 each it seems to be a good deal as well. Apologies if this sells out quickly but wanted to share with you lot.
Also make sure you read their notice: "Due to increased demand, all orders will ship within 4-5 business days from order placement with free express post for orders over $70 - thanks for your patience."