JP
Mondays are tough around here since the privates are generally closed. Ian's suggestion of Huntingdon Valley is excellent, though I doubt they are open for play. Someday you should play all 27 holes.
Ian's work at CC Scranton is excellent and if they're open that too would be a great place to play.
Glen Mills GC (in Glen Mills) is a public course on the grounds of a private school It is an excellent Bobby Weed course on some severe terrain, but great fun none the less.
You could try and arrange play at Merion West. The course is open everyday all year round as long as weather allows. It is short (5989 yards) but lots of fun. You'll never see anything like the stretch between 6-8, the quirky corner. Since you're already playing the East, your connection may be able to help you with the West on a Monday.