Bath was draining slow/sink backing up into bath. Drain cleaner and plunging didn't help. Tried to remove drain trap to see if it was blocked, got the plug side off but couldn't shift the other side. Gave up, put it back together, but now it's dripping around where the plug and trap meet. They are old so want replaced as I assume the seal is just gone now. Not sure of average cost so willing to compare reasonable offers.