Cheap lift........ yep use a jack
You get exactly what you pay for, lifting a vehicle doesn't just affect the obvious things like spring height it affects many other components and some of the suspension design criteria - ALL of which affect the outcome.
Just a few things that change or need to change ....
Required shock length, panhard angle, panhard length, bump stops, caster angle, pinion angle, tail shaft length, tail shaft angle, brake line length, drag link angle, drag ling length, ESP wiring length, ESP calibration, sway bar lik length - and probably a few more that i've overlooked.
So there's no such thing as a good cheap lift - theres "cheap and nasty" lifts, or "lifts in progress". and properly done lifts with the associated costs.
If you can't afford "properly"... start with good quality bits and then work towards the full solution. But always keep in mide that half baked will have consequences.