If you don't need a remote or >100mm drop, I just got one of these for my Explosif and it's an absolute steal
http://m.ebay.co.uk/itm/Height-adjustable-Bike-Vario-Seat-post-Kind-Shock-ETEN-27-2mm-400mm-long-/201865036182
It would be wrong to get one of these for my XC race biek, right?
Not if you want to enjoy life
@Howard started
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If you don't need a remote or >100mm drop, I just got one of these for my Explosif and it's an absolute steal
http://m.ebay.co.uk/itm/Height-adjustable-Bike-Vario-Seat-post-Kind-Shock-ETEN-27-2mm-400mm-long-/201865036182