If cost is an issue, then you're only chance is to get in the cancellation line EARLY.
If cost is not an issue, then you can continue to search Craigslist for tickets, especially closer to those dates after the reviews come out.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle