Pretty much annually we get a clog in our sewer line that requires the rooter man to come out and drill his magic line for black gold. Seems that the tree roots work their way into the pipe (terracotta I think) connections and plug everything up. Well we have a low flow toilet in our main bathroom and while we are glad it saves water, it clogs frequently. Today we thought it was clogged, but turns out the line was just completely backed up. YAY! Mostly I'm just venting because it is frustrating to deal with, but I'm also wondering what the going rate is in your areas to have someone come out and auger their sewer line outside of the house?