There's a small husband and wife team in the next village taking telephone orders which they will deliver to the garden gate so long as you stay out of the way.
That's what our garden centre of choice is doing (the other is closed), you pay over the phone, they put it in their car park, and then hide while you pick it up. they then take the next order out.
But they are limited in what they can sell. Only essential things so no misters (I was after one but they aren't essential and the NHS bought them all), no ornamental plants, only veg seed, some tools, compost and manure. I might have missed some things, he was run ragged and verbally sprinting.