Are you looking for a garage jack or a jack to put in the boot?
The AutoZone by my house has two different jacks depending on what you are looking for. One is a low profile floor jack that is 3" at the lowest point and goes up to about 5" maybe a little lower. It retails for about $120 though. Looked for it on the website but couldn't find it.
The second one is a
1.5 ton scissor jack that is 4" tall when fully lowered. I bought one of these for my full size spare when I go out of town. It is $25 and doesn't take up much space either.
I'm also going to make a little ramp out of wood like topfuel and Rambit have to make it a little easier to get under there once the tire loses air.