Well, i'll be in Toulouse for a week in February and I will be paying €11 to get in for the match against L'OM.
For a team, admittedly in the middle of middle of rugby country, but nonetheless in the top division in France, I find that to be good value.
It's also worth noting that i will be behind one of the goals, along with the more vocal supporters (proper fans). You can however buy tickets ranging from €11 to €34. €20 for decent seats near the halfway line.