With my coverband we have good connections to a PA rental service, which we pay €100/150 euros depending on what set we need. We always get the same guy to come with us too (thank god he's good friends with us so he will work for free if it's a low-profit/playing even gig).
You need a PA or such a deal!
As for bass: in small pubs I don't get to play with DI, pure bass amp force. You need a good amp for that that doesn't go crazy at loud volumes! a 2x10" cab works like a charm in my case, preferably raised above-floor, or tilted if possible.
I was lucky though, to be able to get into a band with such connections!