Joann seems to have a 50% off regular coupon available right now
http://www.joann.com/static/coupon/0.../halloween.gif maybe it helps someone (don't know it it works for everything though). Saw the coupon here
http://www.printablecouponsbirthday....table-coupons/
You can also use this code
AE290 to get 40% off single item at Joann Fabrics (so almost half price online). If the item is over $50, with the code AE290 you get free shipping for Joann.
Happy shopping! Hope it helps someone.
P.S. it seems to me it's cheaper to buy blades directly from Joann (with coupon codes) rather than Amazon. Or maybe I'm wrong.