My favorite things is having a retired stamp set sale so all stamp sets being retired, look up specials category, are 50% off. http://www.mftstamps.com/
Sweet Pea Stamps is having an overstock sale and she has 13 pages of stamps, under super sale section, for only $2 dollars.
Mayzy Art is back and having a 50% off sale so all digis are $1 dollar. http://www.etsy.com/shop/mayzyart
Simply Betty Stamps is having numerous end of year clearance sales... older stamps 50% off, newer stamps 20% off and paper sets 35% off. http://simplybstamps.net/