As someone also looking .... I think Fuss are it. [But they are 5".]
ASDA [UK supermarket] are or were doing a 4" patent court for £12, but largest size would be UK8 or UK9.
Pleaser (or is it Ellie) do a similar style, and I expect will do your size. But who do you (realistically) expect to make inexpensive shoes in your size? For them to get to be inexpensive, they have to make
and sell thousands in your size......
....