For those of you who use bookmarklets, I recently read about one called Salemarked.
Sign up for the free account and then drag the “Salemarked” bookmarklet to your toolbar. The next time you see something you would like to buy on an e-tailer (Etsy, Anthropologie, etc), click the bookmarklet and enter the amount you would be willing to pay for it if it went on sale. The site will then email you if the price drops below your willing sale price. (Note, you do have to be reasonable with your willing sale price!)
Find the bookmarklet on Salemarked.com