You get what you pay for. IMO get a fabtech to start out with. Then if you want something better go Camburg or Dixon Bros. Fabtech ones will come with 3" spindles, shocks and springs(front and rear shocks), control arms with bushings, lift block for the rear and AAL, alignment cam and bolt kit.
You may be paying more in the long run for those ebay junks, because they will wear out. Will have to replace bushings, and shocks and whatever else. If you want to do a cheap lift then just throw on a good 3" body lift. I love my fabtech one it lifts my truck up and can take some abuse, though jumping 20ft sandunes is out of the question. They will break!
Looking for another Ranger for the GF
2006 Mazdaspeed6 aka: SLVRBLT Daily Driver
2004 Ford Ranger aka: URBNRNR SOLD