Have you read anything else of Seanan's? If not, do. She's one of only a few writers whose works (literary *and* musical) I leap to buy sight unseen, every time. If you haven't, next stop should be either "Rosemary and Rue" (first of the so-far-six Toby Daye novels, urban fantasy/detective series) or "Feed" (post-zombie-apocalypse sociopolitical trilogy with comedy, under the open pseud of Mira Grant, third is out in June).

Seriously, the lady is epic, I loved Discount Armageddon as much as you (I don't rate many books 5 stars on GR), and if this is your first time reading her... go! Go grab! <3