Right I'm gonne end up playing some small gigs soon, and I only have a little 10 watt practice amp, and a slightly broken Fender squier precision bass, and a working-ish Wesley something.

I'm loath to fiddle with the insides of them, so:
How much would it be to get it repaired, bearing in mind I think all that's wrong is that the jack has gone through into the body, and the nut's been lost?

And how much would it be for a 15" amp, used?