To the OP, I'm not sure where you got the idea that Rondo only has 30" scale fretless basses. They have a fretless P for $109
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I dunno if I'd recommend a short scale for the first fretless. Usually good to stick with a bass that has a similar feel to an existing bass in the arsenal. The margin of error is a bit smaller on a shorty, although there is some wiggle room when you factor in the rolled off high end.

