http://www.orientaltrading.com
They have paper mache masks you can paint/gear up in a pinch, claws ("martian fingers"), nets and yards of creepy cloth (so even the tattered king can find something) and a lot more, and all on the cheap.
I've been using them for years and they've been pretty reliable, especially if you need it shipped faster than normal, plus they now take PayPal.
I know I'm picking up some 'rusty barbwire cord'. No reason.
