Got one like this, http://www.ebay.co.uk/itm/FORCA-SPS400-27-2-mm-Seatpost-Adjustable-with-REMOTE-Lever-Vario-BIKE-2013-/110944882255?pt=UK_SportGoods_CyclAcces_RL&hash=item19d4d48e4f
except that it's just the straight 100mm dropper - not the variable position.
I bought it for my wife's yeti and she used it a few times but complained that the colours clashed with her blue/gold scheme - so she now has a plain black gravity dropper.
I've been using one for a couple of years now on another bike. They are pretty much gravity dropper clones and are robust and easy to service (not that they need it very often). It has the extra rubber boot to keep the grot out.
Can do pictures later.
Anyway £45 posted in the UK if it's any good for you.
- holiday cottages for cyclists