Earlier this week, the Mets sent out their Six Pack plans
The plans range from $106 to $126 a seat. You can choose from Opening Day plan, Pyrotechnica pack, Hall of fame pack and others. Almost all games are week nights; only three of the plans contain anyweekend game.
All the seats are in the Promenade Reserved. I did a little unscientific searching for two tickets for the most expensive and least expensive plans, looking for "Best available." I ended up in section 501 (Last section in right field), 10th row and section 503, last row.
So the cheapest I could get was $252 in the last row in one of the furthest sections from home plate in the stadium. That's before parking, food and souvenirs.