I bought my Wilier Zero6 with Sram Red in 2019 from one of Europe's largest online-only retailers in their annual sale. It was a 2018 bike in 52cm and one of 3 they were trying to shift. All black, no paint, these bikes were launched by Wilier as lightweight specials at 6.2kg. RRP was 10,999 GBP and I got mine for 4.599 GBP.
It fit perfectly straight out of the box after some tinkering at a bike fit. I have since upgraded the wheels and added a power meter. It is a joy to ride, especially on long steep climbs.
While I do prefer to support my local bike shops and have since only purchased bikes from them, I am no stranger to sight-unseen online buying for cars and electronics. Never had a problem.