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Drakes outlet shop perhaps?
even the Brooks Brothers ones are like £150 which is bonkers. shirts are so expensive.
oh actually, this place is great https://bergbergstore.com/collections/sale-shirts Button down is poplin though, but you might find something you like.
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I’ve got a decent off white one from ‘A days March’ which I will probably buy more of when I need one... actually they have a sale on...
https://www.adaysmarch.com/uk/shop/dyed-oxford-shirt-custom-fit-button-down-off-white
Anglo Italian or Mercer & Sons
or slightly cheaper - Gant https://www.gant.co.uk/mens-shirts/white-regular-fit-oxford-shirt/43469