Thanks Luckygirl. I did find some on Amazon, very similar to those, and I see that they come in sets if three.
I found some that are individually priced and the same size, so ordered those. Perhaps I should have waited, as 'yours' appear to be better value.
Just awaiting delivery now. They are for our garage floor.
What is a reasonable minimum spend for an online grocery delivery??
Another silly little ABC game - shops we have loved and lost?