Cheapest AIB card available right now and in stock at the time of posting from a reputable seller to boot!.
Price once in the basket and at the checkout ends up at €804.74, which translates to less than £675 at time of posting. Make sure you pay in Euro's and use a fee free foreign currency card to get the best price possible.
Here is a LINK!
to the manufacturers marketing and specifications page for those that are interested.
Lowest I can find this anywhere else is £739.99 + P&P
EDIT: Looks like the stock has been depleted, but you can still order from Amazon using the link at the side, as per Amazon.co.uk on the right hand side look for "EUR 805,00
Envío GRATIS disponible. Ver detalles.
Vendido por: Amazon"
EDIT: If you think this is tacky, and want one of the very best GTX 1080 Ti's then you can currently Pre-order the ZOTAC GeForce GTX 1080TI AMP Extreme from Amazon.de - HERE!
works out at £785 at the time of completing this edit, I won't post it as a separate deal yet, but the cheapest I can find it elsewhere is over £830. :)
EDIT: Price has just dropped further to €791 = £669