Where to get graphic cards in UK?

Hi, me and a friend have set up 2 rigs, 6x RX470s on each. We are about to build more but can't source anymore graphic cards, everywhere seems to out of stock of 470/480/570 and 580s. We can get 460s and quite cheap but articles I have read seem to be against 460s.

Can anybody advise on which graphic cards to use which are currently available in the UK. Thanks.