I paid $150/each after fees on Stubhub last year for section 134 Row S, so pretty good seats. Right now the cheapest tickets in that section are over $220. I purchased those 6 days before the game, so unless the market drops some in the next few days it's going to be tougher this year. I'm not going this year anyway. Opening Day is a once every few years "special treat" for me. I just can't justify paying that every year for a baseball game.
The real fans go to the Thursday day game anyway when there's 12,000 people there.