Check out your local music store. Almost every decent store will rent out gear. See what they charge, and if it doesn't seem worth it to you, then point them in the direction of the store. I would say that 250$ for a night is highway robbery personally, considering I can rent a PA worth two grand for 90$ for a whole weekend. Also, it has to do with how well they will treat the drums, if they will pick up, do they even have the money to replace them if they break them? Will they be willing to leave a refundable deposit? Things like that.
Simon