Lantern has $15 student tickets that can be purchased in advance and $10 day-of-show rush. Aside from opening nights, performances in Philly rarely ever sell out, so you should have no trouble snagging a ticket if you want to see it.
I went last week and wasn't so hot on the production overall, which I found too episodic, with lots of clashing design and acting styles that didn't always fit well together. Surprisingly, given the OP's comment about finding the staging accessible, my companion (who had never seen or read the play) had a lot of trouble keeping all the action straight.
It was interesting to see Ben Dibble, who projects such natural affability, cast as Angelo, and I found the contrast between his charming exterior and the character's malicious actions quite successful. But I thought Claire Inie-Richards was a bit one-note as Isabella, and some of the supporting performances (especially Jered McLenigan) were overly broad.
I've seen a lot at Lantern and generally find them pretty hit-or-miss. This production was better than the dull Betrayal they just did but not as good as last season's excellent Tempest.
"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body