I was very lucky, I saw an ad for a second hand Halfords long chassis 3 tonne quick lift trolley jack, £50!
I called the guy straight away, he was surprised as he had only posted it 10 mins before.
Tripped on down to Edinburgh and picked it up, it was like new, apparently only used about 6 times! Bargain.
Used it straight away to change a drive shaft gaitor. One long pump on the handle and it was straight up to the jack point, another couple of small pumps and it was in perfect position.
This was last summer, had a look on Halford website but that model is no longer stocked, been replaced with a different model which to my mind looks a lot smaller (shorter).
As for the ramps always driven on with no probs, getting off............... that's a different matter
guess who forgot the chocks at the front, spat the ramps out the back, lucky nothing nearby as they ejected at great speed and the van came down with a thump! No damage but a lesson learnt!