Thought I'd share, our Living Social is for a half price subscription to Zoobooks. https://livingsocial.com/deals/149967?ref=conf-jp&rpi=31594143
Unfortunately, my area isn't included in that deal. Our deal was for a restaurant today. Mamapedia has this deal for the Ranger Rick series now though...
You should be able to purchase deals for any area. I've bought Fandango deals that were advertised in cities other than mine and have used them successfully.
When I pull up the link, it only gives me the option to enter my city, and then it takes me to that deal.
enter your city as Philadelphia, it should then take you to the deal. Or try this link: http://livingsocial.com/deals/149967; it's a little different than the one above, maybe it will work??