Hydraulic jacks are not very complicated machines and are easy to rebuild with no special tools (except maybe a small magnet to remove steel check balls). Rebuild kits are readily available for most jacks, even the older ones. You can save a lot of money by buying a used jack and rebuilding it. My "other" floor jack is one that a buddy gave me because it would leak down (he bought another jack and this was just taking up space). All I did was disassemble/clean/reassemble and I had a working jack.
An inner tube (or other heavy-duty air bag) might get you off the ground far enough to get a regular floor jack underneath the car.
Some short ramps might give you enough clearance.
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