PriceAdvance Launched out of Beta (now supports IE, too) (priceadvance.com)

Would enjoy your feedback - PriceAdvance's beta launched here in December. We've been building in support for additional merchants, developing the IE version and polishing the Firefox version (which is now out of mozilla's dev sandbox). We're really excited!

I liked this a lot initially. I'll give it a shot again. Congrats!

I used this a few months ago it was great.