The annual Stampin' Up! retiring lists for accessories, punches, cardstock, colors, ribbons, stamp sets (basically anything and everything that is going away) have been posted on the SU website. They have a special section with items 25% off and 50% off.
Also: word is leaking out about price increases in Cardstock and other items, so if you are able to, I do recommend that you purchase cardstock now at the lower price and stock up!! Here are the links for retiring lists! If they aren't working, just copy and paste them into your browser.
Last Chance Stamp sets link:
Last Chance Definitely Decorative Items:
Last Chance Accessories List: