I added an Amazon store of plays by playwrights I've interviewed, along with a few I haven't interviewed and a stray novel or two by playwrights I like. You can get there by scrolling all the way down the page or going here.
Let me stress it took a lot of time but it is in no way all-inclusive. If you see a play I should add please let me know and if I missed your play, I'm sorry. Let me know and I'll add it.