Lidl have got these hydraulic trolley jacks instore from Monday 24/03/14 for £19.99, pretty reasonable and it comes with a 3 year warranty as well.
Product Information :-
Sturdy and easy to manoeuvre with 2 fixed and 2 swivel castors
Adjustable lowering speed
Lifting range approx. (mm): 135 - 342 (or 150 - 357 with supplied adaptor)
Max. load (kg): 2000
With detachable lever for space-saving storage
3 year manufacturer's warranty