How would I search for a small washing up bowl?

[Katymac]

It is for the children's toy kitchen & needs to be 26 by 21 by 9 and it needs to be white

Have you tried your local market (if you have one), or any of the pound shop type places?

With a magnifying glass.

Boom boom.

It's a very odd shape I haven't seen anything similar

If it's to replace one that came with a toy kitchen could you contact the manufacturer for a replacement.

in a small sink?

improvise?
small ice cream tub, tupperware, ?

It's not even oval it's that funny one with straight sides & curved ends (can't remember what it's called geometry was a long long time ago)