Well, there's the Ashbory bass, originally sold by Guild, then taken up later by Fender and DeArmond. Uses the same type of silicon/rubber strings as the new "ukulele basses," but a solid body, passive and active piezo pickups. Pretty good "quasi-acoustic" sound, and the used ones go cheap. I don't think it's being made any more, but used ones pop up regularly.
I have one of the older Guild ones; don't use it much, once in a blue moon, but like having the capability. Good bass for a mandolin player, in a way, since its 18-inch scale's pretty friendly in terms of size and fret separation.
Oh, and you're supposed to us talcum powder on your fingers, to let them slide easily on the rubber strings.
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