but there's still Digikey & Mouser
A few years back I discovered Digikey, which was US only at that point.
Man what an awesome catalog they had: by which I mean a real paper book like the thickest, richest most addictive telephone book you've ever seen. It was like being a kid again.
I literally had to throw it out because I was spending too much time browsing it.
I used them again recently. Their website has not changed in about 30 years and their delivery charges for small orders is still expensive, but the delivery is surprisingly fast. I ordered stuff on the saturday evening, and it was delivered on the monday morning.
The range of components blows anything Maplin or Tandy had right out the water.