I too looked into those, but I'm afraid the discovery that a large deposit is usually in order put me right off! I mean, what's the point? I may as well use that deposit towards the cost of a car that at least I'll own!
Yep, massive deposits, you've still got to finance that massive first year depreciation and after 3 years you have to hand it back with little or nothing to show for it...easy, but not a great deal IMHO
'Buy at 2, sell at 5' is the old traders' adage!
Nowadays, this means buying after the massive initial depreciation, this can be anything from a nearly-new to a 3 year old and then sell before expensive things start to drop off big time, clutches, fuel pumps, injectors, exhausts, alternators, power steering, air-con, wheel bearings, suspension and the multiple electronic gizmos that modern cars have...usually after 50-70k.
To the OP...oh well, it's the age-old problem, it looks like you've got to spend a bit of cash on the old banger and hope that she'll still get you there...but sadly that leaves you with nothing for any aspirations of going for a younger model!! Were we talking cars???