Thread: engine mounts??

I will post under engines this question.I have a sort of rough rumbling sound when idling.It goes away mostly after acceleration.Its been getting louder as days go on.I was told it was the engine mounts going bad.Does this sound like what it might be?When i`m driving ,everything sounds great,its just idleing.What amount of dollars am i looking at for mounts and labor?
thanks for any help