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https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F202436726932
£21 on ebay.
Quality seems ok, the clamp design is more robust and less prone to issues than the inline seatpost style.
I got the same design somewhere else with a different carbon weave, but it was similar price.
Had it on my caad10, so must have had it for about 4 years? No issues, no extra orifices to my knowledge.
got a link to where you got the one with adjuster?
How long you owned it? Any QC issues? Split in two and tore you a new arse hole? etc