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I'll check what the one I bought for my dad cost and if its available now, but iirc it was a similar price and aok.
Ultimately it's a massive Ti tube. As long as the dia is correct it'll be fine.
His had a normal clamp rather than the bso one Brompton favour and it wasn't flared. I never had an issue with the lack of flare - partly because it's not rocket science to not pull it all the way out, and because lately I added a bit of tape at the correct height for my dad to make getting the hight right easier.
Anyone bought one of these seatposts? Wondering whether the price falls into the "too good to be true" bracket
https://www.amazon.co.uk/Titanium-Brompton-Diameter-Lightweight-TITANIUM/dp/B09STMGVBV/ref=sr_1_1_sspa?crid=MVXRQGZFMIN0&keywords=brompton%2Bseatpost&qid=1679480293&sprefix=brompton%2Bseatpost%2Caps%2C75&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1