Would you use a website that notifies you when a must-have item is reduced in price?
I know many fashion retailers email registered users when they go on sale, but many don't.
Often, the specific items you're after may not be in the sale, or may be reduced at some other time.

So I'm researching whether a site...
1) where you list multiple items you're interested in (from any retailer/designer)
2) which checks those prices regularly
3) and then lets you know if they change
...would be useful?