A few weeks ago I blogged about a greasemonkey script to quickly change prices on Etsy for sales. Well now there's an even better tool for this: Etsy on Sale. It uses the Etsy API to edit the prices on either all your listings or just those in a section and then automatically returns them to their previous prices when your sale is over.You can even schedule your sale in advance to give you plenty of time to promote it before it starts.

Handmadeology has a short tutorial on how to use this tool.