You can swap in an auto transmission for about the same or much less money than any other gearing options. For many (including me) an automatic transmission is a much better upgrade than stupid-low gears. If your engine is short on power (Toyota/Suzuki guys) you may not have any other options than low-low gearing.
320-1 Here.
Didn't think I would use them much but there are times gears that low are great.
I got my gearing choices from a 4 speed Atlas. It would be hard to lose that 3rd low range.