Just look at that new seller's storefront - loads of items at prices that indeed are too good to be true. I'm 99% sure ordering anything from that seller will result in a no-delivery and having to claim a refund as it'll be a scam.
Nope. Intel is expected to announce a whole new bunch of processors in September/October the i9 will have come down to “regular” consumer (whatever that means) in all categories, their next launch. I’m stopping myself from going for a new Desktop (long overdue, current is a decade old) till September/October. Then I could invest in current highest spec Intel (which will have been a “previous” version by then). Heat added for someone looking for now, though.
The I7 similar spec version is only £650 new from a marketplace dealer (must be a mistake surely https://www.amazon.co.uk/gp/offer-listing/B071ZPXBNS/ref=olp_twister_child?ie=UTF8&mv_size_name=0&mv_style_name=2