I've listed some Fotodiox Nikon F to Canon EF lens adapters on eBay UK. They appear to be unused old stock - the current model looks slightly different and the boxes are a bit battered but the adapters themselves are in perfect condition. They're priced as buy it now items - £8.99 each (discounts for 2 or more) plus P&P per order, which is £1.55 in the UK, £3.25 for Europe, £4.20 for the rest of the world. Full details in the listing here: https://www.ebay.co.uk/itm/134913736862