Re:
I've been using Ks (kind shock) etens - 1 eten-r - exterior remote and one eten-i interior cable . Ks do a variety of 27.2 droppers (all use the same hydraulic cartridge it appears) I need them because i've damaged something in my hip/thigh and can't get my leg over easily (v painful) They seem well made - approx £103 for the eten -r 100mm but the internally routed 65mm one was £130. I bought one from cyclomonster and the other from ebay. I'm currently waiting for the delivery of one from aliexpress - it was only £66 for 100mm eten-r - hopefully i won't get hit with a load of vat/duty . i need this for the gravel bike i'm building. I've had no problem with the 2 i've got - though the internally routed one was a pain in the arse to fit. they look pretty easy to service according to the online tutorial on ks site.
Update - seatpost arrived - ordered 6th july - received today 18th july - no duty to pay - so hydraulic dropper seatpost for £65.58