Cheap enough
HERE
I made the investment in a decent low entry trolley jack from Costco a couple of years ago.
If you need to jack both sides of the car simultaneously, I use a 1' long 6x6" block of timber, a fencepost cutoff to bridge the "tunnel" section of the rear subframe where the exhaust runs, then jack the car there.
I did this yesterday when replacing an upper rear arm in a hurry for a local member who's car had failed the MOT.
Often when looking at gadgets like this, I think that the faff in setting up might well outweigh the perceived benefits.
Brian